Xiaotian Wei, Chung Nguyen, Patrick David Taylor, Vaishnavi Krishnamurthi, Nitu Syed, Phuong Le, Michelle Jeanette Sapountzis Spencer, Torben Daeneke, Lei Bao
{"title":"Surface Chemistry Altering Electronic Behaviours of Liquid Metal-Derived Tin Oxide Nanosheets","authors":"Xiaotian Wei, Chung Nguyen, Patrick David Taylor, Vaishnavi Krishnamurthi, Nitu Syed, Phuong Le, Michelle Jeanette Sapountzis Spencer, Torben Daeneke, Lei Bao","doi":"10.1039/d4nr01841a","DOIUrl":null,"url":null,"abstract":"Possessing excellent electronic properties and high chemical stability, semiconducting n-type two-dimensional (2D) tin dioxide (SnO<small><sub>2</sub></small>) nanosheets have recently been featured in sensing and electrocatalysis applications. Derived from non-layered crystal structures, 2D SnO<small><sub>2</sub></small> has abundant unsaturated dangling bonds existing at the surface, providing interfacial activity. How the surface chemistry alters the electronic properties of 2D SnO<small><sub>2</sub></small> remains unexplored. In this study, we synthesised ultra-thin 2D SnO<small><sub>2</sub></small> using a liquid metal (LM) touch printing technique and investigated experimentally and theoretically how the interactions of organic solvents composed of alkyl and hydroxyl groups with the surface of LM-derived SnO<small><sub>2</sub></small> modulate electronic properties. It was found that alkane solvents can physically absorb onto the SnO<small><sub>2</sub></small> surface with no impact on the material conductivity. Alcohol-based solvents on the other hand interact with the SnO<small><sub>2</sub></small> surface via chemical absorptions primarily, in which oxygen atoms of hydroxyl groups in the alcohols can bond with the surface atoms of SnO<small><sub>2</sub></small>. The bond stability is determined by the length and configuration of the hydrocarbon chain in alcohols. As representative long-chain alcohols, 1-octanol and 1-pentanol bind onto the SnO<small><sub>2</sub></small> surface strongly, lowering the binding energy of Sn<small><sup>4+</sup></small> and reducing the electron transfer ability of SnO<small><sub>2</sub></small> nanosheets. Consequently, the electronic properties, i.e. conductivity and electronic mobility of SnO<small><sub>2</sub></small> nanosheet-based electronic devices are decreased significantly.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nanoscale","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4nr01841a","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Possessing excellent electronic properties and high chemical stability, semiconducting n-type two-dimensional (2D) tin dioxide (SnO2) nanosheets have recently been featured in sensing and electrocatalysis applications. Derived from non-layered crystal structures, 2D SnO2 has abundant unsaturated dangling bonds existing at the surface, providing interfacial activity. How the surface chemistry alters the electronic properties of 2D SnO2 remains unexplored. In this study, we synthesised ultra-thin 2D SnO2 using a liquid metal (LM) touch printing technique and investigated experimentally and theoretically how the interactions of organic solvents composed of alkyl and hydroxyl groups with the surface of LM-derived SnO2 modulate electronic properties. It was found that alkane solvents can physically absorb onto the SnO2 surface with no impact on the material conductivity. Alcohol-based solvents on the other hand interact with the SnO2 surface via chemical absorptions primarily, in which oxygen atoms of hydroxyl groups in the alcohols can bond with the surface atoms of SnO2. The bond stability is determined by the length and configuration of the hydrocarbon chain in alcohols. As representative long-chain alcohols, 1-octanol and 1-pentanol bind onto the SnO2 surface strongly, lowering the binding energy of Sn4+ and reducing the electron transfer ability of SnO2 nanosheets. Consequently, the electronic properties, i.e. conductivity and electronic mobility of SnO2 nanosheet-based electronic devices are decreased significantly.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.