还原氧化石墨烯包裹二氧化钛纳米纤维对硫化氢的吸附

IF 2.8 4区 工程技术 Q2 CHEMISTRY, APPLIED
Kanchit Kamlangkla, Aphichard Phongphala, Udomdej Pakdee
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引用次数: 0

摘要

本文介绍了一种用于硫化氢(H2S)吸附的室温气体传感器。原始二氧化钛(TiO2)纳米纤维、还原氧化石墨烯(rGO)薄片和还原氧化石墨烯包裹二氧化钛(rGO包裹TiO2)纳米纤维以集成悬浮液的形式呈现,用于气敏层。以聚乙烯吡咯烷酮(PVP)聚合物为原料,采用静电纺丝法制备了TiO2纳米纤维。然后用水热法将氧化石墨烯薄片包裹在TiO2纳米纤维上。扫描电子显微镜、透射电子显微镜、x射线衍射仪和拉曼光谱仪证实TiO2纳米纤维表面存在氧化石墨烯片。利用紫外可见分光光度计计算TiO2和rgo包覆TiO2纳米纤维的带隙。制备完气敏悬浮液后,将其用银交叉电极滴在聚对苯二甲酸乙二醇酯衬底上。评价了传感器在室温下吸附H2S的气敏性能。结果表明,rGO包裹的TiO2纳米纤维气体传感器比原始TiO2纳米纤维和纯rGO气体传感器具有更高的H2S灵敏度和选择性。基于p型rGO薄膜与n型TiO2纳米纤维之间形成的p-n异质结,探讨了rGO包覆TiO2纳米纤维气体传感器的h2s传感机理。此外,通过物理吸附的直接电荷转移过程也被强调为第二种h2s传感机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers
This work presents a fabrication of room-temperature gas sensor for hydrogen sulfide (H2S) adsorption. Pristine titanium dioxide (TiO2) nanofibers, reduced graphene oxide (rGO) sheets, and reduced graphene oxide-wrapped titanium dioxide (rGO-wrapped TiO2) nanofibers were presented in the form of integrated suspension used for a gas-sensing layer. The TiO2 nanofibers were firstly synthesized by using an electrospinning method with a polyvinylpyrrolidone (PVP) polymer. The rGO sheets were then wrapped around TiO2 nanofibers by a hydrothermal method. Scanning electron microscope, transmission electron microscope, X-ray diffractometer, and Raman spectrometer confirmed the presence of rGO sheets onto the surface of TiO2 nanofibers. Ultraviolet-visible spectrophotometer was also considered and displayed to calculate the band gap of TiO2 and rGO-wrapped TiO2 nanofibers. After preparing the gas-sensing suspensions, they were dropped onto the polyethylene terephthalate substrates with silver-interdigitated electrodes. The gas-sensing properties of sensors were evaluated for H2S adsorption at room temperature. Based on the results, the rGO-wrapped TiO2 nanofiber gas sensor exhibited higher H2S sensitivity and selectivity than pristine TiO2 nanofiber and pure rGO gas sensors. The H2S-sensing mechanism of rGO-wrapped TiO2 nanofiber gas sensor was discussed based on a formation of p-n heterojunctions between p-type rGO sheets and n-type TiO2 nanofibers. Furthermore, a direct charge-transfer process by physisorption was also highlighted as a second H2S-sensing mechanism.
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来源期刊
Adsorption Science & Technology
Adsorption Science & Technology 工程技术-工程:化工
CiteScore
5.00
自引率
10.30%
发文量
181
审稿时长
4.5 months
期刊介绍: Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.
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