Electrical and optical properties of semiconducting camphoric carbon films |
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| Affiliation: | 1. Department of Chemistry, Indian Institute of Technology, Bombay, Mumbai 400 076, India;2. Department of Physics, Meijo University, Tempaku-ku, Nagoya 468 8502, Japan;3. Japan Science and Technology Co-operation, c/o Department of Physics, Meijo University, Nagoya 468 8502, Japan;1. Computer Sci and Engineering, National Institute of Technology Agartala, Jirania, Agartala, Tripura, India;2. Electronics and Comm Enggineering, National Institute of Technology Agartala, Agartala, Tripura, India;1. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;1. School of Engineering Sciences and Technology, University of Hyderabad, Gachibowli, Hyderabad 500 046, Telangana, India;2. Thin Film Laboratory, Department of Physics, Sri Venkateswara University, Tirupati 517 502, India;3. Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy;1. Department of Physics, Indus International University Una, Himachal Pradesh 174301, India;2. Department of Physics, National Institute of Technology Hamirpur, Himachal Pradesh 177005, India |
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| Abstract: | In situ variation in resistance of camphoric carbon versus time of pyrolysis, temperature of pyrolysis and effect of sintering are studied to perceive the time required for the completion of pyrolysis and the activation energy from the electrical conductance plot. Variation in the electrical conductance versus temperature and activation energies derived from these measurements, are reproducible when film is thermally treated below 750 °C. Thermal treatment above 750 °C changes the anatomy of the film causing a change in the conductance profile as well as decreases its band gap to 0.1 eV. Camphor pyrolyzed at 650 °C gives semiconducting carbon with optical band gaps 1 eV (direct) and 0.8 eV (indirect). Increase in pyrolysis temperature also shifts G-band of Raman spectrum from 1605 to 1586 cm−1 i.e., towards value corresponding to graphitic carbon. SEM micrograph of camphoric film shows absence of any carbon nanobeads or fibers as normally observed with camphoric carbon pyrolysed in this temperature range. |
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