Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 24, Issue 16, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/24/16/162201
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- German Bundesministerium fur Bildung und Forschung [03IS2071F]
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Polymeric derivatives of dicyandiamide were synthesized via a bulk thermal condensation method, using a range of process temperatures between 400 and 610 degrees C. The obtained carbon nitride powders exhibit an optical transition in the UV-green range that has been assigned to the direct bandgap of a semiconductor-like material. Within this context, the apparent bandgap is linearly tunable with increasing process temperatures, showing a temperature coefficient of -1.7(1) meV K-1 between 2.5 and 3.0 eV. The obtained results show a predominant optical transition within the tri-s-triazine unit of the polymer, with a bathochromic shift originating from a gradually increasing degree of polymerization.
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