Science. 1992 Mar 13;255(5050):1413-6. doi: 10.1126/science.255.5050.1413.
High-temperature, high-pressure extracts of soot produced by the Krätschmer-Huffman technique (KH carbon) were characterized by mass spectrometry and imaging with scanning tunneling microscopes (STMs). The mass spectra of these samples are similar to those of ambient-pressure, high-boiling-point solvent extractions, supporting the idea that solvent temperature and possibly pressure are key parameters in extraction of the giant fuilerenes. The STM images show that the giant fullerenes in these samples are roughly spherical in shape and range in diameter from approximately 1 to 2 nanometers, corresponding to fullerenes containing 60 to 330 atoms. No evidence of bucky tubes was found.
用 Krätschmer-Huffman 技术（KH 碳）生成的烟灰的高温高压提取物，用质谱和扫描隧道显微镜（STM）成像进行了表征。这些样品的质谱与常压、高沸点溶剂提取的质谱相似，支持了溶剂温度，可能还有压力是提取巨型富勒烯的关键参数的观点。STM 图像显示，这些样品中的巨型富勒烯大致呈球形，直径约为 1 至 2 纳米，对应于含有 60 至 330 个原子的富勒烯。没有发现巴基管的证据。
