Enhanced Photoresponsive Ultrathin Graphitic-Phase C3N4 Nanosheets for Bioimaging

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• 作者：Xiaodong Zhang ; Xiao Xie ; Hui Wang ; Jiajia Zhang ; Bicai Pan ; Yi Xie
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：January 9, 2013
• 年：2013
• 卷：135
• 期：1
• 页码：18-21
• 全文大小：324K
• 年卷期：v.135,no.1(January 9, 2013)
• ISSN：1520-5126

文摘

Two-dimensional nanosheets have attracted tremendous attention because of their promising practical application and theoretical values. The atomic-thick nanosheets are able to not only enhance the intrinsic properties of their bulk counterparts but also give birth to new promising properties. Herein, we highlight an available pathway to prepare the ultrathin graphitic-phase C₃N₄ (g-C₃N₄) nanosheets by a 鈥済reen鈥?liquid exfoliation route from bulk g-C₃N₄ in water for the first time. The as-obtained ultrathin g-C₃N₄ nanosheet solution is very stable in both the acidic and alkaline environment and shows pH-dependent photoluminenscence (PL). Compared to the bulk g-C₃N₄, ultrathin g-C₃N₄ nanosheets show enhanced intrinsic photoabsorption and photoresponse, which induce their extremely high PL quantum yield up to 19.6%. Thus, benefiting from the inherent blue light PL with high quantum yields and high stability, good biocompatibility, and nontoxicity, the water-soluble ultrathin g-C₃N₄ nanosheet is a brand-new but promising candidate for bioimaging application.