{"title":"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","authors":"Divyanshu Rathore, Arnab Hazra","doi":"10.1016/j.flatc.2024.100650","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, we report negative photoconductivity in SnO<sub>2</sub>/SnSe<sub>2</sub> nanosheets. We synthesized 2D n-type SnSe<sub>2</sub> 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 SnO<sub>2</sub> skin on SnSe<sub>2</sub> nanosheets was confirmed with X-ray photoelectron spectroscopy (XPS). Negative photoresponse was improved significantly after Au nanoparticles (∼3.4 nm) functionalization of SnO<sub>2</sub>/SnSe<sub>2</sub> nanosheet. Au-SnO<sub>2</sub>/SnSe<sub>2</sub> exhibited responsivity/detectivity of 47.55 mA/W & 1.49 × 10<sup>10</sup> Jones and 47.8 mA/W &1.5 × 10<sup>10</sup> Jones at 10 V bias in visible and NIR light intensity of 50 µW/cm<sup>2</sup>, respectively, and quite a faster fall time of 841 µs and 791 µs in NIR exposure. The origin of NPC in SnSe<sub>2</sub> 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<sub>dark</sub>/I<sub>light</sub>) after Au nanoparticles functionalization on SnO<sub>2</sub>/SnSe<sub>2</sub>.</p></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"45 ","pages":"Article 100650"},"PeriodicalIF":5.9000,"publicationDate":"2024-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Surface trapping induced negative photoconductivity in Au nanoparticles functionalized SnO2/SnSe2 nanosheets under visible and NIR light\",\"authors\":\"Divyanshu Rathore, Arnab Hazra\",\"doi\":\"10.1016/j.flatc.2024.100650\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this study, we report negative photoconductivity in SnO<sub>2</sub>/SnSe<sub>2</sub> nanosheets. We synthesized 2D n-type SnSe<sub>2</sub> 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 SnO<sub>2</sub> skin on SnSe<sub>2</sub> nanosheets was confirmed with X-ray photoelectron spectroscopy (XPS). Negative photoresponse was improved significantly after Au nanoparticles (∼3.4 nm) functionalization of SnO<sub>2</sub>/SnSe<sub>2</sub> nanosheet. Au-SnO<sub>2</sub>/SnSe<sub>2</sub> exhibited responsivity/detectivity of 47.55 mA/W & 1.49 × 10<sup>10</sup> Jones and 47.8 mA/W &1.5 × 10<sup>10</sup> Jones at 10 V bias in visible and NIR light intensity of 50 µW/cm<sup>2</sup>, respectively, and quite a faster fall time of 841 µs and 791 µs in NIR exposure. The origin of NPC in SnSe<sub>2</sub> 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<sub>dark</sub>/I<sub>light</sub>) after Au nanoparticles functionalization on SnO<sub>2</sub>/SnSe<sub>2</sub>.</p></div>\",\"PeriodicalId\":316,\"journal\":{\"name\":\"FlatChem\",\"volume\":\"45 \",\"pages\":\"Article 100650\"},\"PeriodicalIF\":5.9000,\"publicationDate\":\"2024-03-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"FlatChem\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2452262724000448\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"FlatChem","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2452262724000448","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Surface trapping induced negative photoconductivity in Au nanoparticles functionalized SnO2/SnSe2 nanosheets under visible and NIR light
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 Idark/Ilight) after Au nanoparticles functionalization on SnO2/SnSe2.
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)
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