Photoresponse improvement in liquid-exfoliated SnSe nanosheets by reduced graphene oxide hybridization
Photoresponse improvement in liquid-exfoliated SnSe nanosheets by reduced graphene oxide hybridization
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通过减少氧化石墨烯杂化改善液体剥离 SnSe 纳米片的光响应
DOI：
10.1007/s10853-017-1878-8
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发表时间：
2018-03
影响因子：
4.5
通讯作者：
Jianxin Zhong
中科院分区：
文献类型：
--
作者：
Hui Qiao;Zongyu Huang;Xiaohui Ren;Hao Yao;Siwei Luo;Pinghua Tang;Xiang Qi;Jianxin Zhong
采用硒化锡（SnSe）纳米片（NSs）和氧化石墨烯（GO）通过简单的水热还原法合成了SnSe/还原氧化石墨烯（SnSe/RGO）杂化物，其中二维SnSe NSs通过水热插层和剥离过程剥离，GO通过改进的Hummers法合成。包括扫描电子显微镜和透射电子显微镜在内的表征技术验证了大尺寸 SnSe NS 和 SnSe/RGO 混合物。同时，进行了X射线衍射和拉曼光谱分析，证实了SnSe NSs固有的光学和物理性质。此外，还进行了光电化学测试，证明所制备的SnSe/RGO杂化材料的光响应性能比单独的SnSe NSs有了很大的提高。当偏压为0.8 V时，SnSe/RGO杂化材料的光电流密度约为6.42 μA/cm2，大约是单一SnSe NSs（约1.58 μA/cm2）的四倍。同时，与单独的 SnSe NS 相比，SnSe/RGO 混合材料具有更快的光响应速度。光响应性能的提高归因于具有良好导电性的SnSe/RGO杂化以及SnSe/RGO与SnSe NSs之间的耦合，这将有利于促进光生电子空穴对的有效分离。我们的研究结果表明SnSe/RGO杂化材料在光电探测领域具有良好的应用前景。
The SnSe/reduced graphene oxide (SnSe/RGO) hybrid was synthesized by a simple hydrothermal reduction method using tin selenide (SnSe) nanosheets (NSs) and graphene oxide (GO), in which the two-dimensional SnSe NSs were peeled off by hydrothermal intercalation and exfoliation process, and GO was synthesized through an improved Hummers’ method. The characterization techniques including scanning electron microscopy and transmission electron microscopy verified a large-size SnSe NSs and SnSe/RGO hybrid. Meanwhile, X-ray diffraction and Raman spectra were carried out and confirmed the inherent optical and physical properties of SnSe NSs. In addition, the photoelectrochemical tests were carried out and proved that the photoresponse performances of as-prepared SnSe/RGO hybrid were greatly improved compared to that of sole SnSe NSs. When the bias potential was 0.8 V, the photocurrent density of SnSe/RGO hybrid was about 6.42 μA/cm2, which was approximately four times that of sole SnSe NSs (about 1.58 μA/cm2). Meanwhile, SnSe/RGO hybrid possessed faster photoresponse compared to sole SnSe NSs. The improvement in photoresponse performance is due to the hybridization of SnSe/RGO with good conductivity and the coupling between SnSe/RGO and SnSe NSs, which would be beneficial to promote the effective separation of photo-generated electron–hole pairs. Our results show that SnSe/RGO hybrid has a good application prospect in the field of photodetection.
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