Nanostructured WO3 based gas sensors: a short review

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Srinivas Rao Sriram ◽  
Saidireddy Parne ◽  
Venkata Satya Chidambara Swamy Vaddadi ◽  
Damodar Edla ◽  
Nagaraju P. ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Synthesis Method ◽  
Short Review ◽  
Future Research ◽  
Synthesis Methods ◽  
Content Type ◽  
Healthy Environment ◽  
Toxic Gases ◽  
Sensing Performance

Purpose This paper aims to focus on the basic principle of WO3 gas sensors to achieve high gas-sensing performance with good stability and repeatability. Metal oxide-based gas sensors are widely used for monitoring toxic gas leakages in the environment, industries and households. For better livelihood and a healthy environment, it is extremely helpful to have sensors with higher accuracy and improved sensing features. Design/methodology/approach In the present review, the authors focus on recent synthesis methods of WO3-based gas sensors to enhance sensing features towards toxic gases. Findings This work has proved that the synthesis method led to provide different morphologies of nanostructured WO3-based material in turn to improve gas sensing performance along with its sensing mechanism. Originality/value In this work, the authors reviewed challenges and possibilities associated with the nanostructured WO3-based gas sensors to trace toxic gases such as ammonia, H2S and NO2 for future research.

A review on recent advances of CNTs as gas sensors

Sensor Review ◽  
2017 ◽  
Vol 37 (2) ◽  
pp. 127-136 ◽  
Author(s):  
Md.Masud Rana ◽  
Dauda Sh. Ibrahim ◽  
M.R. Mohd Asyraf ◽  
S. Jarin ◽  
Amanullah Tomal
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Future Research ◽  
Content Type ◽  
Healthy Environment ◽  
Advantages And Disadvantages ◽  
Sensing Applications ◽  
Recent Advances ◽  
Different Types ◽  
Temperature Strain

Purpose This review paper aims to focus on recent advances of carbon nanotubes (CNTs) to produce gas sensors. Gas sensors are widely used for monitoring hazardous gas leakages and emissions in the industry, households and other areas. For better safety and a healthy environment, it is highly desirable to have gas sensors with higher accuracy and enhanced sensing features. Design/methodology/approach In this review, the authors focus on recent contributions of CNTs to the technology for developing different types of gas sensors. The design, fabrication process and sensing mechanism of each gas sensor are summarized, together with their advantages and disadvantages. Findings Nowadays, CNTs are well-known materials which have attracted a significant amount of attention owing to their excellent electrical, electronic and mechanical properties. On exposure to various gases, their properties allow the detection of gases using different methods. Therefore, over recent years, researchers have developed several different types of gas sensors along with other types of sensors for temperature, strain, pressure, etc. Originality/value The main purpose of this review is to introduce CNTs as candidates for future research in the field of gas sensing applications and to focus on current technical challenges associated with CNT-based gas sensors.

scholarly journals Recent Advances in Electrochemical Sensors for Detecting Toxic Gases: NO2, SO2 and H2S

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 905 ◽  
Author(s):  
Md Khan ◽  
Mulpuri Rao ◽  
Qiliang Li
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Electrochemical Sensors ◽  
Gas Sensing ◽  
Performance Comparison ◽  
Toxic Gases ◽  
Recent Advances ◽  
Metal Metal ◽  
Sensor Materials ◽  
Sensing Performance

Toxic gases, such as NOx, SOx, H2S and other S-containing gases, cause numerous harmful effects on human health even at very low gas concentrations. Reliable detection of various gases in low concentration is mandatory in the fields such as industrial plants, environmental monitoring, air quality assurance, automotive technologies and so on. In this paper, the recent advances in electrochemical sensors for toxic gas detections were reviewed and summarized with a focus on NO2, SO2 and H2S gas sensors. The recent progress of the detection of each of these toxic gases was categorized by the highly explored sensing materials over the past few decades. The important sensing performance parameters like sensitivity/response, response and recovery times at certain gas concentration and operating temperature for different sensor materials and structures have been summarized and tabulated to provide a thorough performance comparison. A novel metric, sensitivity per ppm/response time ratio has been calculated for each sensor in order to compare the overall sensing performance on the same reference. It is found that hybrid materials-based sensors exhibit the highest average ratio for NO2 gas sensing, whereas GaN and metal-oxide based sensors possess the highest ratio for SO2 and H2S gas sensing, respectively. Recently, significant research efforts have been made exploring new sensor materials, such as graphene and its derivatives, transition metal dichalcogenides (TMDs), GaN, metal-metal oxide nanostructures, solid electrolytes and organic materials to detect the above-mentioned toxic gases. In addition, the contemporary progress in SO2 gas sensors based on zeolite and paper and H2S gas sensors based on colorimetric and metal-organic framework (MOF) structures have also been reviewed. Finally, this work reviewed the recent first principle studies on the interaction between gas molecules and novel promising materials like arsenene, borophene, blue phosphorene, GeSe monolayer and germanene. The goal is to understand the surface interaction mechanism.

scholarly journals Oxygen-Deficient Stannic Oxide/Graphene for Ultrahigh-Performance Supercapacitors and Gas Sensors

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 372
Author(s):  
Liyang Lin ◽  
Susu Chen ◽  
Tao Deng ◽  
Wen Zeng
Keyword(s):  
Energy Storage ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Synthesis Method ◽  
Rate Capability ◽  
Stannic Oxide ◽  
Energy Storage Devices ◽  
Graphene Nanocomposites ◽  
Storage Devices

The metal oxides/graphene nanocomposites have great application prospects in the fields of electrochemical energy storage and gas sensing detection. However, rational synthesis of such materials with good conductivity and electrochemical activity is the topical challenge for high-performance devices. Here, SnO2/graphene nanocomposite is taken as a typical example and develops a universal synthesis method that overcome these challenges and prepares the oxygen-deficient SnO2 hollow nanospheres/graphene (r-SnO2/GN) nanocomposite with excellent performance for supercapacitors and gas sensors. The electrode r-SnO2/GN exhibits specific capacitance of 947.4 F g−1 at a current density of 2 mA cm−2 and of 640.0 F g−1 even at 20 mA cm−2, showing remarkable rate capability. For gas-sensing application, the sensor r-SnO2/GN showed good sensitivity (~13.8 under 500 ppm) and short response/recovering time toward methane gas. These performance features make r-SnO2/GN nanocomposite a promising candidate for high-performance energy storage devices and gas sensors.

scholarly journals Nanostructured SmFeO3 Gas Sensors: Investigation of the Gas Sensing Performance Reproducibility for Colorectal Cancer Screening

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5910
Author(s):  
Andrea Gaiardo ◽  
Giulia Zonta ◽  
Sandro Gherardi ◽  
Cesare Malagù ◽  
Barbara Fabbri ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Gas Sensors ◽  
Process Development ◽  
Gas Sensing ◽  
Diagnostic Tools ◽  
Fecal Samples ◽  
Recovery Times ◽  
Medical Diagnostic ◽  
Response And Recovery ◽  
Sensing Performance

Among the various chemoresistive gas sensing properties studied so far, the sensing response reproducibility, i.e., the capability to reproduce a device with the same sensing performance, has been poorly investigated. However, the reproducibility of the gas sensing performance is of fundamental importance for the employment of these devices in on-field applications, and to demonstrate the reliability of the process development. This sensor property became crucial for the preparation of medical diagnostic tools, in which the use of specific chemoresistive gas sensors along with a dedicated algorithm can be used for screening diseases. In this work, the reproducibility of SmFeO3 perovskite-based gas sensors has been investigated. A set of four SmFeO3 devices, obtained from the same screen-printing deposition, have been tested in laboratory with both controlled concentrations of CO and biological fecal samples. The fecal samples tested were employed in the clinical validation protocol of a prototype for non-invasive colorectal cancer prescreening. Sensors showed a high reproducibility degree, with an error lower than 2% of the response value for the test with CO and lower than 6% for fecal samples. Finally, the reproducibility of the SmFeO3 sensor response and recovery times for fecal samples was also evaluated.

Emerging 2D hybrid nanomaterials: towards enhanced sensitive and selective conductometric gas sensors at room temperature

2020 ◽  
Vol 8 (38) ◽  
pp. 13108-13126
Author(s):  
Hanie Hashtroudi ◽  
Ian D. R. Mackinnon ◽  
Mahnaz Shafiei
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Hybrid Nanomaterials ◽  
Sensing Performance

Gas sensing performance of conductometric devices based on 2D hybrid nanomaterials operating at room temperature.

Systematic investigation on the gas-sensing performance of TiO 2 nanoplate sensors for enhanced detection on toxic gases

2016 ◽  
Vol 73 ◽  
pp. 302-307 ◽  
Author(s):  
Wei Guo ◽  
Qingqin Feng ◽  
Yufang Tao ◽  
Lijun Zheng ◽  
Zongyao Han ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Systematic Investigation ◽  
Toxic Gases ◽  
Sensing Performance

Consumer xenocentrism in China: an exploratory study

2015 ◽  
Vol 28 (1) ◽  
pp. 73-91 ◽  
Author(s):  
Rene Dentiste Mueller ◽  
George Xun Wang ◽  
Guoli Liu ◽  
Charles Chi Cui
Keyword(s):  
Focus Groups ◽  
Cultural Values ◽  
Marketing Research ◽  
Deep Understanding ◽  
Short Review ◽  
Chinese Economy ◽  
Future Research ◽  
Chinese History ◽  
Content Type ◽  
Foreign Products

Purpose – Marketing research has focussed more on in-group favoritism and out-group derogation (i.e. ethnocentrism) than out-group favoritism and in-group derogation (i.e. xenocentrism). The purpose of this paper is to explore the xenocentric behavior in the consumer sphere to explain why some consumers have a bias for foreign products even when domestic ones are qualitatively similar or better. As the Chinese economy has experienced more than three decades of near double-digit growth and increased openness to foreign products, it is important to examine phenomena related to the formation of Chinese attitudes toward foreign products with the rising tensions between the seemingly irreversible globalization and Chinese re-awakening nationalism. Design/methodology/approach – This study is based on a review of the extant literature and focus groups in three cities in China. Findings – This study has found that consumer xenocentrism (CX) is prevalent in China, especially among the new emerging wealthy classes, younger consumers, and the local elite. It appears that Chinese consumers are psychologically or sociologically orientated or predisposed toward foreign (Western) goods. The findings from this study suggest that both consumer ethnocentrism and CX are possible or even expected. The short review of Chinese history presented here has shown that these phenomena can be explained by traditional in-group/out-group theories. Specifically, when there are too many xenocentrics, national esteem is threatened and this prompts many individuals to become more ethnocentric. Research limitations/implications – This study is based on the literature and focus groups data, hence, the findings are not intended to be generalizable. Practical implications – The findings from this study should be of interest to business practitioners and policy makers. Social implications – The historical and cultural perspectives taken in this study indicate that understanding consumers’ xenocentric behavior entails knowledge and deep understanding of how cultural values and contemporary social-political forces interplay within consumers’ formation and change of attitudes toward the choice of domestic and foreign products. Originality/value – This study shows that the ability of foreign products to meet the individual’s need or enhance his/her self-esteem more so than domestic products is indicative of something more than simply an international, cosmopolitan, or modern orientation. The fact that consumer foreign bias is found with both mundane and widely available products, expensive and inexpensive products, and conspicuous and non-conspicuous goods challenges the assumption that this phenomenon is simply traditional prestige-consumption behavior. Future research needs to be directed at measuring the CX construct and examine potential antecedents of such a behavior.

Nanomaterial gas sensors for biosensing applications: A Review

2021 ◽  
Vol 15 ◽  
Author(s):  
Kurmendra
Keyword(s):  
Gas Sensor ◽  
Crystalline Structure ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Review Article ◽  
Morphological Properties ◽  
Future Research ◽  
Sensing Application ◽  
Detection Of Biomolecules ◽  
2D And 3D

Background: Nanomaterial is one of the most used materials for various gas sensing application to detect toxic gases, human breath, and other specific gas sensing. One of the most important applications of nanomaterial based gas sensors is as biosensing applications. In this review article, the gas sensors for biosensing are discussed by classifying gas sensors on the basis of crystalline structure and different categories of nanomaterial. Methods: In this paper, firstly rigorous efforts has been made to find out research questions by going through structured and systematic survey of available peer reviewed high quality articles in this field. The papers related to nanomaterial based biosensors are then reviewed qualitatively to provide substantive findings from the recent developments in this field. Results: In this review article, firstly classifications of nanomaterial gas sensors have been presented on the basis of crystalline structure of nanomaterial and different types of nanomaterial available for biosensing applications. Further, the gas sensors based on nanomaterial for biosensing applications are collected and reviewed in terms of their performance parameters such as sensing material used, target gas component, detection ranges (ppm-ppb), response time, operating temperature and method of detection etc. The different nanomaterials possess slightly different sensing and morphological properties due to their structure, therefore, it can be said that a nanomaterial must be selected carefully for particular application. The 1D nanomaterials show best selectivity and sensitivity for gases available in low concentration ranges due to their miniaturised structure as compared to 2D and 3D nanomaterials. However, these 2D and 3D nanomaterials also so good sensing properties compared to bulk semiconductor materials. The polymer and nanocomposites have opened door for future research and have great potential for new generation gas sensor for detecting biomolecules. Conclusion: These nanomaterials extend great properties towards sensing application of different gases for lower concentration of particular gas particles. Nano polymer and nano composites have great potential to be used gas sensor for detection of biomolecules.

Learning preference: development in smart learning environments

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lizhao Zhang ◽  
Xu Du ◽  
Jui-Long Hung ◽  
Hao Li
Keyword(s):  
Learning Environments ◽  
Synthesis Method ◽  
Learning Preferences ◽  
Future Research ◽  
Content Type ◽  
Learning Preference ◽  
Smart Learning ◽  
Smart Learning Environments ◽  
Art Research ◽  
State Of Art

Purpose The purpose of this study is to conduct a systematic review to understand state-of-art research related to learning preferences from the aspects of impacts, influential factors and evaluation methods. Design/methodology/approach This paper uses the systematic synthesis method to provide state-of-the-art knowledge on learning preference research by summarizing published studies in major databases and attempting to aggregate and reconcile the scientific results from the individual studies. The findings summarize aggregated research efforts and improve the quality of future research. Findings After analyzing existing literature, this study proposed three possible research directions in the future. First, researchers might focus on how to use the real-time tracking mechanism to further understand other impacts of learning preferences within the learning environments. Second, existing studies mainly focused on the influence of singular factors on learning preferences. The joint effects of multiple factors should be an important topic for future research. Finally, integrated algorithms might become the most popular evaluation method of learning preference in the era of smart learning environments. Research limitations/implications This review used the search results generated by Google Scholar and Web of Science databases. There might be published papers available in other databases that have not been taken into account. Originality/value The research summarizes the state-of-art research related to learning preferences. This paper is one of the first to discuss the development of learning preference research in smart learning environments.

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