Nanoscale Heterostructured Materials Based on Metal Oxides for a Chemiresistive Gas Sensor

Abstract

Nanomaterials with exceptional physical and chemical properties are the key to the success of the next generation of gas sensor technology, which is expected to have special features like being lightweight and flexible for wearability, mechanical robustness, reliable operation with wide environmental changes, and self-powered, in addition to the general sensor characteristics. The design of the chemiresistor with nanostructured hybrid material has indicated a great potential to meet these current demands, drawing significant attention to the technological developments in the past decades. The nanotechnology driven strategic design of the hybrid nanostructures is predicted to be pivotal for the development of nanomaterials bearing distinct physical and chemical properties and catalytic power, enabling them to produce overall improvements in sensor efficiency. In this review, a comprehensive review on the recent progress of hybrid gas sensors fabricated by coupling various metal oxides and 2D materials like transition metal dichalcogenides, graphene, and its derivatives are presented. The limitations of the current materials, key challenges, as well as the futuristic strategy for material design delivering fascinating properties and modern growth techniques are highlighted. A special emphasis has been given to hybrid sensors made with transition metal dichalcogenides, which are considered to be an emerging material and very few works have reported on its hybrid with metal oxides. The relevance of reliable detection of hydrogen is felt due to the dramatic rise in the use of hydrogen in industrial, commercial, and household purposes. As the whole world is moving toward a hydrogen economy, reliable, accurate, and robust hydrogen sensors will be a crucial component of the technological systems. In view of this, the current status and recent progress on hydrogen sensors based on heterostructured nanomaterials are also presented to the reader.

Interplay of electrode geometry and bias on charge transport in organic heterojunction gas sensors

“…Metal oxide semiconductors have been associated among each other or with the varieties of 2D materials like transition metal dichalcogenides, Mxenes and graphene to develop heterostructure sensing materials [10]. Chemiresistor gas sensors based on these heterostructures have shown high sensitivity and selectivity for redox gases [11][12][13][14][15].…”

Biogenic Photo-Catalyst TiO2 Nanoparticles for Remediation of Environment Pollutants

“…Due to an increased surface to volume ratio, extreme physical and chemical changes occur in materials at this level. In recent years, nanotechnology has rapidly gained popularity with its applications in science and technology for creating new materials at the nanoscale level that are beneficial to various areas such as the economy and the environment . Recent studies have featured potential applications of TiO 2 nanoparticles (NPs) in various fields such as pigments, photo-catalysis, solar energy conversion, sensor technology, and biological activity such as antibacterial activities, anticancer activity, and antifungal activities. , In spite of their wide range of applications, TiO 2 NPs are characterized by a number of miscellaneous properties, such as high chemical stability, high redox potential, low cost, and eco-friendly nature. , In addition, these properties are also heavily affected by the method by which NPs are synthesized, such as the specific surface area, crystal structure, particles shape, and crystallite size .…”

Ultra-Sensitive Photo-Induced Hydrogen Gas Sensor Based on Two-Dimensional CeO2-Pd-PDA/rGO Heterojunction Nanocomposite

“…Thus, there is a critical need for the subsequent development of H 2 sensing and measurement techniques that are accurate, robust, real-time, power efficient, and scalable for deployment over large spatial scales to accommodate critical data for safe, effective, and efficient H 2 production, storage, and usage [ 1 ]. Many semiconducting materials are used for conductometric H 2 sensing, including graphene-based materials, transition metal dichalcogenides, and metal oxides [ 5 , 6 ]. Many different sensing technologies have been developed for H 2 sensing [ 7 , 8 , 9 ] and semiconductor-based H 2 sensors mainly present high sensitivity, quick response, and good stability based on their physical and electrochemical characteristics [ 10 , 11 , 12 , 13 , 14 ].…”