One-step electrochemical synthesis of ultrathin graphitic carbon nitride nanosheets and their application to the detection of uric acid
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A one-step electrochemical method for synthesis of ultrathin g-C3N4 nanosheets is reported. This method does not need dangerous reagents and largely reduces the reaction time.Keywords:
Graphitic carbon nitride
Carbon nitride
Carbon fibers
A one-step electrochemical method for synthesis of ultrathin g-C3N4 nanosheets is reported. This method does not need dangerous reagents and largely reduces the reaction time.
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Polymeric graphitic carbon nitride (g-CN) has been a hot topic in the last 11 years as a metal-free, cheap, non-toxic and tunable semiconductor material. Fundamental interest arises from its photocatalytic performance, yet a comprehensive interplay between its syntheses, modification, application and scaling up is missing. This chapter will guide a journey for understanding the concept of g-CN synthesis and how the synthesis can be manipulated for designing advanced materials. Furthermore, g-CN composites, both metal and organic, will be depicted in detail. Last, emerging applications of g-CN materials will be exhibited. All chapters will be presented via a nanoarchitectonics perspective to strengthen understanding.
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Both carbon and nitrogen defects are formed in the porous carbon nitride after proper PVP addition and heating in air. It exhibits improved photocatalytic hydrogen evolution performance with increasing carbon to nitrogen atomic ratio.
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Graphitic carbon nitride
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Graphitic carbon nitride (g-C3N4) is a well-known two-dimensional conjugated polymer semiconductor that has been broadly applied in photocatalysis-related fields. However, further developments of g-C3N4, especially in device applications, have been constrained by the inherent limitations of its insoluble nature and particulate properties. Recent breakthroughs in fabrication methods of g-C3N4 films have led to innovative and inspiring applications in many fields. In this review, we first summarize the fabrication of continuous and thin films, either supported on substrates or as free-standing membranes. Then, the novel properties and application of g-C3N4 films are the focus of the current review. Finally, some underlying challenges and the future developments of g-C3N4 films are tentatively discussed. This review is expected to provide a comprehensive and timely summary of g-C3N4 film research to the wide audience in the field of conjugated polymer semiconductor-based materials.
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Graphitic carbon nitride materials show some promising properties for applications such as photocatalytic water splitting. However, the conversion efficiency is still low due to factors such as a low surface area and limited light absorption. In this paper, we describe a “triple templating” approach to generating porous graphitic carbon nitride. The introduction of pores on several length-scales results in enhanced photocatalytic properties.
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Abstract The use of two-dimensional templates like clay, in the synthesis of graphitic carbon nitrides, make it feasible to form exfoliated layer like structures by polymerization of the precursors in the clay galleries. We have used clay linked with aminopropyl groups, aminoclay, to template the carbon nitride into mesolamellar structures. By virtue of its aminopropyl groups, aminoclay is further capable of reacting along with the intercalated precursors to enrich the carbon content of the resulting carbon nitrides.
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We quantify the thermodynamic equilibrium conditions that govern the formation of crystalline heptazine-based carbon nitride materials, currently of enormous interest for photocatalytic applications including solar hydrogen evolution. Key phases studied include the monomeric phase melem, the 1D polymer melon, and the hypothetical hydrogen-free 2D graphitic carbon nitride phase "g-C3N4". Our study is based on density functional theory including van der Waals dispersion terms with different experimental conditions represented by the chemical potential of NH3. Graphitic carbon nitride is the subject of a vast number of studies, but its existence is still controversial. We show that typical conditions found in experiments pertain to the polymer melon (2D planes of 1D hydrogen-bonded polymer strands). In contrast, equilibrium synthesis of heptazine (h)-based g-h-C3N4 below its experimentally known decomposition temperature requires much less likely conditions, equivalent to low NH3 partial pressures around 1 Pa at 500 °C and around 103 Pa even at 700 °C. A recently reported synthesis of triazine (t)-based g-t-C3N4 in a salt melt is interpreted as a consequence of the altered local chemical environment of the C3N4 nanocrystallites.
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