The highly toxic hydrogen sulphide (HS) present in air can cause negative effects on human health. Thus, monitoring of this gas is vital in gas leak alarms and security. Efforts have been devoted to the fabrication and enhancement of the HS-sensing performance of gas sensors. Herein, we used electron beam evaporation to decorate nickel oxide (NiO) nanoparticles on the surface of tin oxide (SnO) nanowires to enhance their HS gas-sensing performance. The synthesised NiO-SnO materials were characterised by field-emission scanning electron microscopy, transmission electron microscopy and energy dispersive spectroscopy analysis. HS gas-sensing characteristics were measured at various concentrations (1-10 ppm) at 200-350 °C. The results show that with effective decoration of NiO nanoparticles, the HS gas-sensing characteristics of SnO nanowires are significantly enhanced by one or two orders compared with those of the bare material. The sensors showed an effective response to low-level concentrations of HS in the range of 1-10 ppm, suitable for application in monitoring of HS in biogas and in industrial controls. We also clarified the sensing mechanism of the sensor based on band structure and sulphurisation process.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9063983 | PMC |
| http://dx.doi.org/10.1039/c9ra01105f | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effect of the Chemical Structure of a Self-Assembled Monolayer on the Gas-Sensing Behavior of SnO Nanowires.
ACS Sens
December 2024
Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea.
In this study, detailed investigations of the selective sensing capability of semiconducting metal oxide (SMO)-based gas sensors with self-assembled monolayer (SAM) functionalization were conducted. The selective gas-sensing behavior was improved by employing a simple and straightforward postmodification technique using functional SAM molecules. The chemical structure of the SAM molecules promoted interaction between the gas and SAM molecules, providing a gas selective sensing of SnO nanowires (NWs).
View Article and Find Full Text PDFExcitation-Power-Dependent Color Tuning in a Single Sn-Doped CdS Nanowire.
Molecules
November 2024
State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environments and Materials, Guangxi University, Nanning 530004, China.
Multicolor emission and dynamic color tuning with large spectral range are challenging to realize but critically important in many areas of technology and daily life, such as general lighting, display, multicolor detection and multi-band communication. Herein, we report an excitation-power-dependent color-tuning emission from an individual Sn-doped CdS nanowire with a large spectral range and continuous color tuning. Its photoluminescence (PL) spectrum shows a broad trap-state emission band out of Sn dopants, which is superposed by whispering-gallery (WG) microcavity due to the nanostructure size and its structure, besides the CdS band-edge emission.
View Article and Find Full Text PDFImpedance Spectroscopy Study of Charge Transfer in the Bulk and Across the Interface in Networked SnO/GaO Core-Shell Nanobelts in Ambient Air.
Sensors (Basel)
September 2024
Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.
Metal oxide core-shell fibrous nanostructures are promising gas-sensitive materials for the detection of a wide variety of both reducing and oxidizing gases. In these structures, two dissimilar materials with different work functions are brought into contact to form a coaxial heterojunction. The influence of the shell material on the transportation of the electric charge carriers along these structures is still not very well understood.
View Article and Find Full Text PDFImaging of Volatile Organic Compounds Using a Single Nanowire-Based Electronic Nose for Future Biomedical Applications.
ACS Sens
October 2024
Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
This study introduces an array of semiconductor oxide single nanowires fabricated using advanced semiconductor processing techniques, including electron beam lithography and thin-film deposition, which is well-suited for large-scale nanowire integration. A four-channel nanowire array consisting of tin oxide (SnO), indium oxide (InO), ferric oxide (FeO), and titanium oxide (TiO) was developed. As a proof of concept, we converted the response curves of the sensor array to heat maps, enabling comprehensive feature representation.
View Article and Find Full Text PDFElectronic Structure of Mg-, Si-, and Zn-Doped SnO Nanowires: Predictions from First Principles.
Materials (Basel)
May 2024
Department of Technical Physics, L.N. Gumilyov Eurasian National University, Satpayev Str. 2, 010008 Astana, Kazakhstan.
We investigated the electronic structure of Mg-, Si-, and Zn-doped four-faceted [001]- and [110]-oriented SnO nanowires using first-principles calculations based on the linear combination of atomic orbitals (LCAO) method. This approach, employing atomic-centered Gaussian-type functions as a basis set, was combined with hybrid density functional theory (DFT). Our results show qualitative agreement in predicting the formation of stable point defects due to atom substitutions on the surface of the SnO nanowire.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!