Pyrolysis in the Mesophase: A Chemist's Approach toward Preparing Carbon Nano- and Microparticles
详细信息 查看全文
- 作者：Lileta Gherghel ; Christian Kü ; bel ; Gü ; nter Lieser ; Hans-Joachim Rä ; der ; and Klaus Mü ; llen
- 刊名：Journal of the American Chemical Society
- 出版年：2002
- 出版时间：November 6, 2002
- 年：2002
- 卷：124
- 期：44
- 页码：13130 - 13138
- 全文大小：854K
- 年卷期：v.124,no.44(November 6, 2002)
- ISSN：1520-5126
文摘
A mild pyrolytic method is proposed for the generation of different carbon micro- and nanoparticlesthat are either unprecedented or have never been reported under the present experimental conditions. Ahexa-alkyl-substituted hexa-peri-hexabenzocoronene serves as a graphite-like starting compound that meltsinto a discotic liquid crystalline phase prior to heat-induced cross-linking and dehydrogenation. An essentialfeature of the process is that the liquid crystalline order persists even above 400 
C, i.e., during alkyl chaincleavage. The present approach bears a resemblance to carbomesophase formation during graphitizationstarting from pitch. The pyrolysis products are characterized by matrix-assisted laser desorption/ionizationtime-of-flight (MALDI-TOF) mass spectrometry, optical microscopy, selected area electron diffraction (SAED),scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM).
C, i.e., during alkyl chaincleavage. The present approach bears a resemblance to carbomesophase formation during graphitizationstarting from pitch. The pyrolysis products are characterized by matrix-assisted laser desorption/ionizationtime-of-flight (MALDI-TOF) mass spectrometry, optical microscopy, selected area electron diffraction (SAED),scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM).