{"id":3115,"date":"2026-07-12T05:18:57","date_gmt":"2026-07-12T05:18:57","guid":{"rendered":"https:\/\/www.thefullerene.com\/?p=3115"},"modified":"2026-07-14T03:50:18","modified_gmt":"2026-07-14T03:50:18","slug":"c60-characterization-methods-what-hplc-ms-icp-ms-and-tga-reveal","status":"publish","type":"post","link":"https:\/\/www.thefullerene.com\/ko\/c60-characterization-methods-what-hplc-ms-icp-ms-and-tga-reveal\/","title":{"rendered":"C60 \ud2b9\uc131 \ubd84\uc11d \ubc29\ubc95: HPLC, MS, ICP-MS \ubc0f TGA\uac00 \ubc1d\ud788\ub294 \uac83"},"content":{"rendered":"\n

A reported HPLC purity is an important piece of information about Fullerene C60, but it is not a complete description of the material. An HPLC chromatogram may reveal C60, C70 and other soluble components that separate and respond under the selected method. It does not automatically establish molecular identity, detect every inorganic element, quantify residual solvents or describe how the material behaves during heating.<\/p>\n\n\n\n

Reliable C60 characterization therefore depends on combining analytical methods that answer different questions. Chromatography examines separated components. Molecular mass spectrometry and spectroscopy support identity. Elemental methods investigate metals and other elements. Gas chromatography can address volatile residues, while thermogravimetric analysis examines mass change during controlled heating. The appropriate combination depends on whether the material will be used in routine research, molecular synthesis, solution processing or repeated vacuum deposition.<\/p>\n\n\n\n

\"Fullerene
Fullerene C60 characterization using complementary analytical methods<\/figcaption><\/figure>\n\n\n\n

Why C60 Cannot Be Characterized by One Number<\/h2>\n\n\n\n

Fullerene C60 is a defined molecular carbon cage containing 60 carbon atoms. IUPAC identifies C60 as the archetypal fullerene, whose atoms and bonds form a truncated-icosahedral cage.[1]<\/a><\/sup> A commercial C60 powder, however, is more than an ideal molecular structure written on paper. It is a physical material produced, extracted, purified, dried, packaged and stored through a sequence of real processes.<\/p>\n\n\n\n

Different impurity classes can enter or remain at different stages. A fullerene mixture may include C70, higher fullerenes or fullerene-related reaction products. Extraction and purification can introduce or retain solvents. Production equipment and starting materials may contribute inorganic elements. Incompletely removed carbonaceous material may behave differently from soluble fullerene molecules. Moisture, packaging exposure and thermal history can also influence how a sample behaves in a sensitive process.<\/p>\n\n\n\n

These components do not all respond to the same analytical method. A compound that does not dissolve during HPLC sample preparation cannot be represented accurately by the chromatogram. An element detected after acid digestion does not appear as a conventional molecular HPLC peak. A residual solvent may evaporate before a solid-state measurement, while a molecular isomer can share the same nominal mass as the desired structure.<\/p>\n\n\n\n

For this reason, \u201c99.95% C60\u201d should always be interpreted together with the method and calculation basis. It may mean a relative HPLC peak-area result under specified conditions. It should not be silently expanded into claims such as 99.95% total mass purity, zero metals, zero solvent, zero ash or universal suitability for every application.<\/p>\n\n\n\n

Start by Defining the Analytical Question<\/h2>\n\n\n\n

A useful characterization plan begins with the question the laboratory is trying to answer. \u201cIs this material C60?\u201d is different from \u201cHow much chromatographically detectable C70 is present?\u201d Both differ again from \u201cWill the source material behave consistently during repeated thermal evaporation?\u201d<\/p>\n\n\n\n

The distinction can be organized into five analytical questions:<\/p>\n\n\n\n

Analytical question<\/th>Representative methods<\/th>Main evidence produced<\/th><\/tr><\/thead>
Is the molecular material consistent with C60?<\/td>Mass spectrometry, FTIR, Raman, UV\u2013Vis and, where appropriate, NMR<\/td>Molecular mass or characteristic spectroscopic response<\/td><\/tr>
Which soluble fullerene-related components are present?<\/td>HPLC with a suitable detector and separation method<\/td>Retention behavior, separated peaks and relative or calibrated quantities<\/td><\/tr>
Are relevant elemental residues present?<\/td>ICP-MS, ICP-OES or another validated elemental method<\/td>Concentrations of specified elements after appropriate preparation<\/td><\/tr>
Are volatile processing residues present?<\/td>Headspace GC or direct-injection GC with suitable detection<\/td>Identification or quantification of targeted volatile compounds<\/td><\/tr>
How does the sample change during heating?<\/td>TGA, DSC or application-specific thermal processing tests<\/td>Mass loss, thermal transitions and process-relevant behavior<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

No row in this table replaces the others. Each method is strongest when used to answer the question it was designed to address.<\/p>\n\n\n\n

\"Complementary
Complementary analytical pathways for characterizing Fullerene C60<\/figcaption><\/figure>\n\n\n\n

HPLC: Fullerene Composition Under Defined Conditions<\/h2>\n\n\n\n

High-performance liquid chromatography is particularly useful for separating C60 from C70, higher fullerenes and other compounds that dissolve, travel through the column and respond to the detector. A chromatogram plots detector response against retention time. If the separation is sufficiently selective, C60 and relevant fullerene impurities can appear as distinguishable peaks.<\/p>\n\n\n\n

Relative area normalization is commonly used to express the C60 peak as a percentage of the total integrated peak area. This number is convenient, but its meaning depends on sample preparation, column chemistry, mobile phase, detector wavelength, integration rules and detector response. Components that do not dissolve, elute or respond adequately may not be represented.<\/p>\n\n\n\n

A large C60 peak therefore supports chromatographic composition under that method. It does not independently quantify residual solvent, water, metals, ash or undissolved carbonaceous matter. It also does not guarantee that a minor component is absent when it co-elutes with C60.<\/p>\n\n\n\n

The dedicated C60 HPLC purity analysis guide<\/a> explains retention time, peak area, separation quality and method limitations in greater depth. The present article treats HPLC as one component of a broader analytical strategy rather than repeating that guide.<\/p>\n\n\n\n

Mass Spectrometry: Molecular Mass and Species Assignment<\/h2>\n\n\n\n

Mass spectrometry separates gas-phase ions according to their mass-to-charge ratio. For C60, the nominal molecular mass is associated with a 60-carbon cage, and an appropriate mass spectrum can provide strong evidence that a sample contains a species with the expected molecular mass. PubChem records the molecular formula C60 and a molecular weight of approximately 720.64 g\/mol.[2]<\/a><\/sup><\/p>\n\n\n\n

Mass spectrometry was central to the original recognition of unusually stable carbon clusters containing 60 atoms. The 1985 discovery paper reported a dominant C60 cluster and proposed its closed-cage structure.[3]<\/a><\/sup> Later work on macroscopic solid C60 combined mass spectrometry with infrared and diffraction evidence.[4]<\/a><\/sup><\/p>\n\n\n\n

For modern quality characterization, mass spectrometry can support molecular identity and reveal other molecular species within the instrument\u2019s operating range. Depending on the analytical problem, laboratories may use MALDI, laser desorption, electrospray-compatible approaches for derivatives, or chromatography coupled with mass spectrometry.<\/p>\n\n\n\n

A mass spectrum still requires interpretation. Ionization efficiency differs among compounds, fragmentation or clustering may occur, and the absence of an ion signal is not automatically proof that a substance is absent. Two structural isomers can also share the same elemental formula and nominal mass. Mass spectrometry is therefore especially persuasive when interpreted alongside chromatography and characteristic spectroscopy.<\/p>\n\n\n\n

FTIR and Raman Spectroscopy: Structural Fingerprints<\/h2>\n\n\n\n

Vibrational spectroscopy examines how a molecule or solid interacts with infrared radiation or scattered light. C60 has characteristic vibrational behavior arising from its highly symmetrical carbon cage. Comparing an unknown sample with an appropriate reference spectrum can provide evidence consistent with the expected structure.<\/p>\n\n\n\n

The historical isolation of solid C60 illustrates the value of combining methods. Kr\u00e4tschmer and co-workers used infrared spectroscopy, X-ray diffraction and mass spectrometry to support the assignment and physical characterization of solid C60.[4]<\/a><\/sup> The strength of the conclusion came from convergence among different forms of evidence rather than one instrument alone.<\/p>\n\n\n\n

FTIR and Raman spectroscopy are useful for confirming characteristic cage vibrations, detecting major structural modification and comparing pristine C60 with functionalized materials. They are less suitable as stand-alone methods for declaring a highly precise total purity percentage. A spectrum that resembles C60 may still contain a low-level impurity below the method\u2019s practical sensitivity or an impurity whose bands overlap with the principal material.<\/p>\n\n\n\n

Sampling configuration also matters. Transmission, attenuated total reflectance, Raman excitation wavelength, laser power, sample concentration and physical form can alter the appearance or intensity of the recorded spectrum. Reference comparisons should use compatible conditions wherever possible.<\/p>\n\n\n\n

UV\u2013Visible Spectroscopy: Optical Identity and Solution Behavior<\/h2>\n\n\n\n

C60 solutions have characteristic absorption behavior in suitable solvents. UV\u2013visible spectroscopy can therefore support identity, monitor concentration within a calibrated range and reveal changes in solution or molecular environment.<\/p>\n\n\n\n

The method becomes quantitative only when the laboratory has an appropriate relationship between absorbance and concentration under defined conditions. Solvent, wavelength, path length, concentration range, aggregation and instrumental baseline all influence the result. A visually purple C60 solution is not itself quantitative evidence of purity.<\/p>\n\n\n\n

UV\u2013visible spectra are especially useful during solution preparation, chromatography-fraction monitoring and comparative optical studies. They should not be treated as a universal replacement for HPLC, mass spectrometry or residual-solvent analysis.<\/p>\n\n\n\n

ICP-MS and ICP-OES: Specified Elemental Residues<\/h2>\n\n\n\n

When metals or other inorganic elements are relevant, an elemental method is required. ICP-MS and ICP-OES analyze elements rather than intact fullerene molecules. The sample is normally brought into a form compatible with the instrument, often through digestion or another validated preparation procedure.<\/p>\n\n\n\n

ICP-MS can provide low detection limits for many elements, while ICP-OES may be appropriate at different concentration ranges. Method selection depends on the target element list, expected concentration, matrix, required detection limits and potential spectral interferences. EPA Method 6020B, for example, describes ICP-MS principles, calibration and quality-control considerations for elemental determinations in suitable prepared samples.[5]<\/a><\/sup> It is not a universal C60 product specification, but it illustrates why sample preparation, calibration and interference control must be defined.<\/p>\n\n\n\n

An elemental statement should specify what was tested. \u201cNo metals detected\u201d is incomplete without an element list, method, preparation procedure, reporting limit and batch. A result below the reporting limit means that the method did not quantify that element above the stated threshold; it does not establish absolute zero.<\/p>\n\n\n\n

Elemental analysis also answers a different question from HPLC. A sample can show a strong C60 HPLC peak and still contain an element that the chromatographic detector does not measure. Conversely, a low result for selected metals does not establish molecular purity.<\/p>\n\n\n\n

Gas Chromatography: Residual Solvents and Volatile Compounds<\/h2>\n\n\n\n

Fullerene production and purification may involve organic solvents. When residual volatiles are relevant to a process, gas chromatography can be used to investigate specified compounds. Headspace GC is often attractive because volatile components can be sampled from the gas phase above a heated sample without introducing the entire non-volatile matrix into the chromatographic system.<\/p>\n\n\n\n

The method must be designed around the solvents that could plausibly occur in the process. Calibration standards, sample mass, equilibration temperature, equilibration time, vial conditions and detector selection influence the result. A generic scan cannot guarantee equal sensitivity to every possible volatile compound.<\/p>\n\n\n\n

ICH Q3C provides a risk-based framework for residual solvents in pharmaceutical materials.[6]<\/a><\/sup> That guideline should not be presented as an automatic specification for research-grade C60 or electronic materials. Its relevance here is methodological: residual solvents should be identified, assessed and controlled according to intended use rather than collapsed into a general HPLC purity figure.<\/p>\n\n\n\n

TGA and DSC: Thermal Behavior, Not Molecular Identity<\/h2>\n\n\n\n

Thermogravimetric analysis records the mass of a sample while temperature changes according to a controlled program. It can reveal mass-loss events associated with volatile material, adsorbed species, decomposition or oxidation under the selected atmosphere. Differential scanning calorimetry measures differences in heat flow and can reveal thermal events that may not produce a large mass change.<\/p>\n\n\n\n

These methods can be valuable when C60 will experience drying, heating, sublimation or vacuum deposition. However, a TGA mass-loss step does not identify a compound by itself. Additional analysis may be required to determine whether the evolved material is water, a solvent, an oxidation product or another component.<\/p>\n\n\n\n

Atmosphere and heating rate are critical. A result obtained in nitrogen cannot be assumed to describe behavior in air or under high vacuum. Sample mass, pan type and temperature calibration also affect interpretation. Thermal data should therefore be reported with the method conditions rather than as an isolated \u201cdecomposition temperature.\u201d<\/p>\n\n\n\n

XRD and Solid-State Analysis: Packing, Crystallinity and Phase<\/h2>\n\n\n\n

X-ray diffraction examines ordered structure in the solid state. It can support the identification of crystalline phases, compare packing behavior and detect substantial differences between materials. It does not directly replace molecular HPLC purity because a diffraction pattern is influenced by crystallinity, orientation, polymorphism and sample preparation.<\/p>\n\n\n\n

A sample may contain molecular C60 while differing in crystal form, particle history or degree of order. These differences can matter in solid-state research and processing even when the molecular formula remains unchanged.<\/p>\n\n\n\n

Microscopy and particle-size methods can provide additional information when powder morphology, agglomeration or dispersion behavior is important. Those measurements characterize physical form rather than intrinsic molecular purity.<\/p>\n\n\n\n

Why Thermal-Evaporation Programs Need More Than HPLC<\/h2>\n\n\n\n

Repeated thermal evaporation is a useful example of application-driven characterization. An HPLC result may confirm a high proportion of chromatographically detectable C60, but the evaporation process can also be influenced by volatile residues, non-volatile material, source coalescence and batch-dependent thermal behavior.<\/p>\n\n\n\n

A 2024 Nature Communications<\/em> study reported that as-received commercial C60 source material could coalesce during repeated evaporation in the investigated perovskite-cell process. Further sublimation purification improved repeatability in that system.[7]<\/a><\/sup> The study does not establish one universal specification for every evaporator or device architecture. It demonstrates a broader principle: material behavior during the intended process can reveal quality differences that a single compositional percentage does not capture.<\/p>\n\n\n\n

For an evaporation program, a technically meaningful evaluation may combine molecular identity, chromatographic composition, relevant elemental or volatile analysis, thermal behavior and a controlled deposition trial. The final deposition test connects analytical data with the actual process.<\/p>\n\n\n\n

\"C60
C60 source characterization for repeatable vacuum thermal evaporation<\/figcaption><\/figure>\n\n\n\n

Building an Application-Specific C60 Characterization Plan<\/h2>\n\n\n\n

The goal is not to request every possible instrument for every C60 sample. Excessive testing can add cost without improving a decision. The better approach is to identify the failure modes that would materially affect the project.<\/p>\n\n\n\n

General molecular and materials research<\/h3>\n\n\n\n

A practical baseline may combine identity evidence with a selective HPLC method. Additional measurements should be added when the experiment is sensitive to solvents, elements, moisture or physical form.<\/p>\n\n\n\n

Fullerene derivative synthesis<\/h3>\n\n\n\n

Precursor composition can affect reaction mixtures and downstream purification. HPLC can assess other fullerene-related components, while mass spectrometry and spectroscopic methods support the identity of the precursor and synthesized products. For derivatives, NMR and other structure-specific methods may become more informative than they are for routine pristine C60 evaluation.<\/p>\n\n\n\n

Solution-processed electronics<\/h3>\n\n\n\n

Solvent compatibility, concentration, aggregation, film formation and trace residues may all matter. Analytical data should be interpreted alongside controlled solution preparation and film testing rather than assuming that the highest HPLC number produces the best device.<\/p>\n\n\n\n

Thermal evaporation<\/h3>\n\n\n\n

Chromatographic composition should be supplemented by evidence relevant to heating and repeated source use. Thermal analysis, residual-volatile assessment and controlled deposition trials may be important depending on the process.<\/p>\n\n\n\n

Coatings, composites and lubricant research<\/h3>\n\n\n\n

In these systems, dispersion and formulation stability can dominate performance. Molecular purity remains relevant, but particle aggregation, compatibility with the base material and application-specific testing may have greater practical influence than a small difference in advertised HPLC area.<\/p>\n\n\n\n

How to Read a C60 Analytical Package<\/h2>\n\n\n\n

Analytical results become useful when the tested batch, method and reporting basis are clear. A chromatogram should identify the sample and relevant method conditions. An elemental report should identify the measured elements and reporting limits. A residual-solvent report should identify the target compounds and quantitative basis. Thermal curves should state atmosphere and heating program.<\/p>\n\n\n\n

Method performance also matters. ICH Q2(R2) describes concepts such as specificity, range, accuracy, precision and detection capability in analytical-procedure validation.[8]<\/a><\/sup> Although developed for pharmaceutical analytical procedures, these concepts provide useful general vocabulary for evaluating whether a method is fit for its intended purpose. They should not be misrepresented as mandatory certification requirements for every fullerene product.<\/p>\n\n\n\n

The central question is not how many reports accompany the material. It is whether the evidence answers the technical risks of the application. A concise, well-defined analytical package is more valuable than a collection of unrelated certificates or unqualified purity claims.<\/p>\n\n\n\n

Conclusion<\/h2>\n\n\n\n

C60 characterization is strongest when different methods are used for distinct purposes. HPLC examines separated soluble components. Mass spectrometry and spectroscopy support molecular identity. ICP-based methods address specified elements. Gas chromatography examines targeted volatile compounds. Thermal and solid-state methods reveal behavior that composition alone cannot describe.<\/p>\n\n\n\n

No single result proves every aspect of material quality. The correct analytical strategy connects method capability with the intended experiment, formulation or manufacturing process. This approach produces more defensible conclusions and avoids turning one precise-looking percentage into a claim it was never designed to support.<\/p>\n\n\n\n

Frequently Asked Questions<\/h2>\n\n\n\n

Is HPLC enough to confirm the total purity of Fullerene C60?<\/h3>\n\n\n\n

No. HPLC can measure components that dissolve, separate and respond under the selected method, but it does not automatically quantify metals, residual solvents, moisture, ash or undetected compounds.<\/p>\n\n\n\n

Which method confirms that a sample contains C60?<\/h3>\n\n\n\n

Mass spectrometry and characteristic spectroscopic methods can provide evidence consistent with C60 identity. The strongest assignment normally combines more than one compatible analytical technique.<\/p>\n\n\n\n

How are metal residues measured in C60?<\/h3>\n\n\n\n

Specified elemental residues can be measured using techniques such as ICP-MS or ICP-OES after suitable sample preparation. The report should identify the tested elements, method and reporting limits.<\/p>\n\n\n\n

Can TGA determine the purity of C60?<\/h3>\n\n\n\n

TGA records mass change during controlled heating and can reveal volatile loss or thermal events, but it does not identify every component or provide a complete molecular purity measurement by itself.<\/p>\n\n\n\n

How can residual solvents in C60 be tested?<\/h3>\n\n\n\n

Targeted residual solvents can be investigated using a suitable gas-chromatographic method, often headspace GC. The method should be designed around plausible solvents and calibrated for the compounds being reported.<\/p>\n\n\n\n

What characterization is relevant for C60 thermal evaporation?<\/h3>\n\n\n\n

Thermal-evaporation programs may combine identity, HPLC composition, relevant elemental or volatile testing, thermal behavior and a controlled deposition trial under the intended process conditions.<\/p>\n\n\n\n

References<\/h2>\n\n\n\n
    \n
  1. IUPAC Gold Book. \u201cFullerenes.\u201d https:\/\/goldbook.iupac.org\/terms\/view\/F02547\/plain<\/a><\/li>\n\n\n\n
  2. PubChem, National Library of Medicine. \u201cFullerenes | C60 | CID 123591.\u201d https:\/\/pubchem.ncbi.nlm.nih.gov\/compound\/Fullerenes<\/a><\/li>\n\n\n\n
  3. Kroto, H. W., Heath, J. R., O\u2019Brien, S. C., Curl, R. F. and Smalley, R. E. \u201cC60: Buckminsterfullerene.\u201d Nature<\/em>, 318, 162\u2013163, 1985. https:\/\/www.nature.com\/articles\/318162a0<\/a><\/li>\n\n\n\n
  4. Kr\u00e4tschmer, W., Lamb, L. D., Fostiropoulos, K. and Huffman, D. R. \u201cSolid C60: A New Form of Carbon.\u201d Nature<\/em>, 347, 354\u2013358, 1990. https:\/\/www.nature.com\/articles\/347354a0<\/a><\/li>\n\n\n\n
  5. United States Environmental Protection Agency. \u201cMethod 6020B: Inductively Coupled Plasma\u2014Mass Spectrometry.\u201d https:\/\/www.epa.gov\/sites\/default\/files\/2015-12\/documents\/6020b.pdf<\/a><\/li>\n\n\n\n
  6. International Council for Harmonisation. \u201cQ3C: Impurities\u2014Guideline for Residual Solvents.\u201d https:\/\/www.ich.org\/page\/quality-guidelines<\/a><\/li>\n\n\n\n
  7. Said, A. A., et al. \u201cSublimed C60 for Efficient and Repeatable Perovskite-Based Solar Cells.\u201d Nature Communications<\/em>, 15, 708, 2024. https:\/\/www.nature.com\/articles\/s41467-024-44974-0<\/a><\/li>\n\n\n\n
  8. International Council for Harmonisation. \u201cQ2(R2): Validation of Analytical Procedures.\u201d https:\/\/www.ich.org\/page\/quality-guidelines<\/a><\/li>\n<\/ol>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    A reported HPLC purity is an important piece of information about Fullerene C60, but it is not a complete description of the material. An HPLC chromatogram may reveal C60, C70 and other soluble components that separate and respond under the selected method. It does not automatically establish molecular identity, detect every inorganic element, quantify residual […]<\/p>\n","protected":false},"author":1,"featured_media":3117,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[46],"tags":[],"class_list":["post-3115","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/posts\/3115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/comments?post=3115"}],"version-history":[{"count":3,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/posts\/3115\/revisions"}],"predecessor-version":[{"id":3125,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/posts\/3115\/revisions\/3125"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/media\/3117"}],"wp:attachment":[{"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/media?parent=3115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/categories?post=3115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thefullerene.com\/ko\/wp-json\/wp\/v2\/tags?post=3115"}],"curies":[{"name":"\uc6cc\ub4dc\ud504\ub808\uc2a4","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}