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Tuning the band gap...
Tuning the band gap and the nitrogen content in carbon nitride materials by high temperature treatment at high pressure
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Yang, Zhenxing (author)
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Hu, Kuo (author)
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Meng, Xianwei (author)
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Tao, Qiang (author)
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Dong, Jiajun (author)
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Liu, Bo (author)
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Lu, Qian (author)
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Zhang, Hua (author)
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- Sundqvist, Bertil (author)
- Umeå universitet,Institutionen för fysik,State Key Laboratory of Superhard Materials, College of Physics, Jilin University, People's Republic of China
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Zhu, Pinwen (author)
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Yao, Mingguang (author)
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Liu, Bing bing (author)
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(creator_code:org_t)
- Elsevier, 2018
- 2018
- English.
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In: Carbon. - : Elsevier. - 0008-6223 .- 1873-3891. ; 130, s. 170-177
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https://umu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Carbon nitride (C-N) materials have been attracting great interest because of their extraordinary performance in photocatalysis and energy conversion. However, developing an effective strategy for achieving band-gap engineering of C-N materials to satisfy practical applications remains highly desired. Here we report an efficient way to tune the band gap and control the nitrogen stoichiometry in carbon nitride compounds by using high pressure and high temperature (HPHT) treatment. It is found that treating a g-C3N4 precursor at relatively low temperature (630oC and below) under pressure can efficiently narrow the band gap even down to the red light region (~600 nm), increase the crystallinity, and significantly improve the charge carrier separation efficiency (by two orders of magnitude), almost without changing their stoichiometry. When increasing the treatment temperature under pressure, nitrogen-doped graphene/graphite materials with weak ferromagnetism were obtained. We thus obtained C-N materials with tunable band gaps, ranging from semiconducting to metallic states. XPS measurements show that pyridinic nitrogen is preferentially eliminated under such HPHT conditions while graphitic nitrogen is preserved in the C-N network. Our results thus provide an efficient strategy for tuning the structure and physical properties of C-N materials for applications.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Carbon nitride
- high pressure
- nitrogen stoichiometry
- band gap
- XPS
- Raman scattering
- X-ray diffraction
- fysik
- Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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Carbon
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- By the author/editor
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Yang, Zhenxing
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Hu, Kuo
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Meng, Xianwei
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Tao, Qiang
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Dong, Jiajun
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Liu, Bo
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show more...
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Lu, Qian
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Zhang, Hua
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Sundqvist, Berti ...
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Zhu, Pinwen
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Yao, Mingguang
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Liu, Bing bing
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Carbon
- By the university
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Umeå University