Enhanced Photoresponsive Ultrathin Graphitic-Phase C3N4 Nanosheets for Bioimaging
Enhanced Photoresponsive Ultrathin Graphitic-Phase C3N4 Nanosheets for Bioimaging
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用于生物成像的增强型光响应超薄石墨相 C3N4 纳米片
DOI：
10.1021/ja308249k
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发表时间：
2013-01-09
影响因子：
15
通讯作者：
Xie, Yi
中科院分区：
文献类型：
--
作者：
Zhang, Xiaodong;Xie, Xiao;Xie, Yi
二维纳米片由于具有广阔的实际应用前景和理论价值而受到广泛关注。原子厚度的纳米片不仅能够增强其块状材料的固有特性，而且还能产生新的有前途的特性。在此，我们首次强调了通过“绿色”液体剥离途径从水中的块状g-C3N4制备超薄石墨相C3N4 （g-C3N4）纳米片的可行途径。所制得的超薄g-C3N4纳米片溶液在酸性和碱性环境下都非常稳定，并表现出ph依赖性光致发光（PL）。超薄g-C3N4纳米片具有增强的本征光吸收和光响应，其PL量子产率高达19.6%。因此，水溶性超薄g-C3N4纳米片具有高量子产率、高稳定性、良好的生物相容性和无毒性等优点，是一种全新的生物成像应用前景。
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 "green" 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 photohuninenscence (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.