Surface trapping induced negative photoconductivity in Au nanoparticles functionalized SnO2/SnSe2 nanosheets under visible and NIR light

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem Pub Date : 2024-03-24 DOI:10.1016/j.flatc.2024.100650

Divyanshu Rathore, Arnab Hazra

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Abstract

In this study, we report negative photoconductivity in SnO₂/SnSe₂ nanosheets. We synthesized 2D n-type SnSe₂ nanosheets by the hydrothermal route and observed highly stable and repeatable negative photoconductivity (NPC) in the presence of both visible (532 nm) and near-infrared (NIR, 905 nm) irradiation. The existence of native SnO₂ skin on SnSe₂ nanosheets was confirmed with X-ray photoelectron spectroscopy (XPS). Negative photoresponse was improved significantly after Au nanoparticles (∼3.4 nm) functionalization of SnO₂/SnSe₂ nanosheet. Au-SnO₂/SnSe₂ exhibited responsivity/detectivity of 47.55 mA/W & 1.49 × 10¹⁰ Jones and 47.8 mA/W &1.5 × 10¹⁰ Jones at 10 V bias in visible and NIR light intensity of 50 µW/cm², respectively, and quite a faster fall time of 841 µs and 791 µs in NIR exposure. The origin of NPC in SnSe₂ is attributed to the trapping of photogenerated hot carriers by surface adsorption of oxygen in ambient air. The NPC was further increased due to a significant increment of dark current (as well as I_dark/I_light) after Au nanoparticles functionalization on SnO₂/SnSe₂.

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金纳米颗粒功能化 SnO2/SnSe2 纳米片在可见光和近红外光下的表面捕获诱导负光电导性

在这项研究中，我们报告了 SnO2/SnSe2 纳米片的负光电导性。我们通过水热法合成了二维 n 型 SnSe2 纳米片，并在可见光（532 纳米）和近红外（905 纳米）辐照下观察到了高度稳定和可重复的负光电导性（NPC）。X 射线光电子能谱 (XPS) 证实了 SnSe2 纳米片上原生二氧化锡表皮的存在。金纳米粒子（∼3.4 nm）功能化 SnO2/SnSe2 纳米片后，负光反射明显改善。在可见光和 50 µW/cm2 的近红外光强度下，Au-SnO2/SnSe2 在 10 V 偏置下的响应率/检出率分别为 47.55 mA/W & 1.49 × 1010 Jones 和 47.8 mA/W & 1.5 × 1010 Jones，在近红外光照射下的下降时间分别为 841 µs 和 791 µs。SnSe2 中 NPC 的产生归因于光生热载流子在环境空气中被表面吸附的氧气捕获。在 SnO2/SnSe2 上进行金纳米粒子功能化后，由于暗电流（以及 Idark/Ilight）显著增加，NPC 进一步增加。

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来源期刊

FlatChem Multiple-

CiteScore

8.40

自引率

6.50%

发文量

104

审稿时长

26 days

期刊介绍： FlatChem - Chemistry of Flat Materials, a new voice in the community, publishes original and significant, cutting-edge research related to the chemistry of graphene and related 2D & layered materials. The overall aim of the journal is to combine the chemistry and applications of these materials, where the submission of communications, full papers, and concepts should contain chemistry in a materials context, which can be both experimental and/or theoretical. In addition to original research articles, FlatChem also offers reviews, minireviews, highlights and perspectives on the future of this research area with the scientific leaders in fields related to Flat Materials. Topics of interest include, but are not limited to, the following: -Design, synthesis, applications and investigation of graphene, graphene related materials and other 2D & layered materials (for example Silicene, Germanene, Phosphorene, MXenes, Boron nitride, Transition metal dichalcogenides) -Characterization of these materials using all forms of spectroscopy and microscopy techniques -Chemical modification or functionalization and dispersion of these materials, as well as interactions with other materials -Exploring the surface chemistry of these materials for applications in: Sensors or detectors in electrochemical/Lab on a Chip devices, Composite materials, Membranes, Environment technology, Catalysis for energy storage and conversion (for example fuel cells, supercapacitors, batteries, hydrogen storage), Biomedical technology (drug delivery, biosensing, bioimaging)