Activation of carbon nitride solids by protonation: morphology changes, enhanced ionic conductivity, and photoconduction experiments.
Activation of carbon nitride solids by protonation: morphology changes, enhanced ionic conductivity, and photoconduction experiments.
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DOI：
10.1021/ja808329f
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发表时间：
2009-01
影响因子：
15
通讯作者：
Yuanjian Zhang;Arne Thomas;M. Antonietti;Xinchen Wang
中科院分区：
文献类型：
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作者：
Yuanjian Zhang;Arne Thomas;M. Antonietti;Xinchen Wang
钴键合的氮化碳材料（例如，g-C（3）N（4））具有从半导体到燃料电池的许多潜在应用。但是它们的溶解性差，这使得表征和加工困难。此外，合成的碳氮化物的化学性质被广泛忽视。在这里，我们报告说，这些障碍中的一些可能被克服的可控和可逆的质子化。结果发现，质子化不仅提供了更好的分散性和暴露g-C（3）N（4）的高表面积，而且还能够调节电子带隙和更高的离子电导率。通过简单的加热可以获得向原始g-C（3）N（4）的恢复或去质子化，这使得能够改善烧结，而且还可能保留质子化材料的更高表面积。这种质子增强的烧结过程首次允许直接测量材料的光电导性。通过质子化的辅助作用，通过简单的阴离子交换，也可以容易地得到其它有前途的g-C（3）N（4）基杂化复合材料。
Covalently bonded carbon nitride materials (e.g., g-C(3)N(4)) have numerous potential applications ranging from semiconductors to fuel cells. But their solubility is poor, which makes characterization and processing difficult. Moreover, the chemistry of the as-synthesized carbon nitrides has been widely neglected. Here we report that some of these handicaps might be overcome by a controllable and reversible protonation. It was found that protonation not only provides better dispersion and exposes a high surface area for g-C(3)N(4) but also enables an adjustment of electronic band gaps and higher ionic conductivity. Recovery or deprotonation toward the original g-C(3)N(4) could be obtained by simple heating, which enables improved sintering but also a potential preservation of the higher surface area of the protonated material. This proton-enhanced sintering process allowed for the first time direct measurement of the photoconductivity of the material. By aid of protonation, other promising g-C(3)N(4) based hybrid composites could also be facilely obtained by simple counteranion exchange.