One step preparation of proton-functionalized photoluminescent graphitic carbon nitride and its sensing applications
One step preparation of proton-functionalized photoluminescent graphitic carbon nitride and its sensing applications
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质子功能化光致发光石墨氮化碳的一步制备及其传感应用
DOI：
10.1039/c6ra22829a
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Wang Jian-Hua
中科院分区：
文献类型：
--
作者：
Wang Yi-Ting;Wang Ning;Chen Ming-Li;Yang Ting;Wang Jian-Hua
石墨氮化碳（g-C3N4）因其独特的结构和优越的光学性能在催化、传感和生物成像领域引起了广泛的关注。已报道的 g-C3N4 合成方法通常需要高反应温度和长反应时间；此外，块状g-C3N4的宏观尺寸和较差的水溶性严重限制了其实际应用。在此，我们首次报道了一种在微波下以硫脲和 HNO3 为原料快速一步制备质子功能化 g-C3N4 的方法。将原材料超声剥离4小时后，很容易获得在溶液中分散良好的g-C3N4纳米片。 g-C3N4 纳米片带正电且超薄，平面尺寸约为 100 nm。 60-90 nm，厚度为 3.3 nm。氯化血红素的存在会导致 g-C3N4 的荧光显着猝灭，因此开发了一种灵敏且选择性的氯化血红素传感方法，检测限为 0.17 μg mL−1。该方法进一步用于分析一系列生物样品中的血红素。
Graphitic carbon nitride (g-C3N4) has aroused extensive attention in the field of catalysis, sensing and bioimaging due to its unique structure and superior optical properties. Reported synthesis procedures for g-C3N4 usually need high reaction temperatures and long reaction times; in addition, the macro size and poor water solubility of bulk g-C3N4 significantly limit its practical applications. Herein, we report for the first time a fast one-step approach for the preparation of proton-functionalized g-C3N4 under microwave with thiourea and HNO3 as source materials. After ultrasonic stripping of the raw material for 4 h, well dispersed g-C3N4 nanosheets in solution are readily obtained. The g-C3N4 nanosheets are positively charged and ultrathin, with a planar size of ca. 60–90 nm and a thickness of 3.3 nm. The presence of hemin causes a significant quenching on the fluorescence of g-C3N4, and a sensitive and selective hemin sensing approach is thus developed, with a detection limit of 0.17 μg mL−1. The method is further utilized for the analysis of hemin in a series of biological samples.