Gas Sensors Based on Single-Wall Carbon Nanotubes

Abstract

Single-wall carbon nanotubes (SWCNTs) have a high aspect ratio, large surface area, good stability and unique metallic or semiconducting electrical conductivity, they are therefore considered a promising candidate for the fabrication of flexible gas sensors that are expected to be used in the Internet of Things and various portable and wearable electronics. In this review, we first introduce the sensing mechanism of SWCNTs and the typical structure and key parameters of SWCNT-based gas sensors. We then summarize research progress on the design, fabrication, and performance of SWCNT-based gas sensors. Finally, the principles and possible approaches to further improving the performance of SWCNT-based gas sensors are discussed.

Three‐Terminal Artificial Olfactory Sensors based on Emerging Materials: Mechanism and Application

“…They are lightweight, have a perfect hexagonal connection structure, and have been applied in many fields. [ 115 ] The unique atomically thin structure of CNTs provides numerous advantages when they are used as sensitive materials. Sacco et al.…”

“…Owing to their high surface-to-volume ratio, controlled unidirectional electrical properties, and well-defined crystal orientations, 1D materials, such as nanowires and carbon nanotubes, have been investigated for FET-based gas sensors, and they have exhibited a fast response, high selectivity, and stability. [114,115] Commonly used nanowire materials for gas sensors include silicon, carbon nanotubes, and metal oxides.…”

“…They are lightweight, have a perfect hexagonal connection structure, and have been applied in many fields. [115] The unique atomically thin structure of CNTs provides numerous advantages when they are used as sensitive materials. Sacco et al reported an ultrasensitive NO 2 gas sensor by directly connecting the source and drain electrodes with several individual single-walled carbon nanotubes (SWCNTs).…”

Phenylboronic acid conjugated poly(3,4-ethylenedioxythiophene) (PEDOT) coated Ag dendrite for electrochemical non-enzymatic glucose sensing

“…39,40 Another is the strategy of pre-processing its substrate to control its morphology, such as using photolithography, etching, etc., 41 but special experimental equipment is required. The third strategy is to use materials such as MOF, 42,43 covalent organic frameworks, 44,45 graphene, 46 carbon nanotubes, 47 and nanocomposite 48,49 as support interlayers to increase the electrode-specific surface area or electrical conductance.…”

Structure and Technological Parameters’ Effect on MISFET-Based Hydrogen Sensors’ Characteristics

“…In recent years, based on nano- on micro-technologies, gas sensors with low sensitivity thresholds and low inertia have been developed. For example, new developments used nanostructured palladium films and Pd nanotubes [ 22 ], electrodeposited nanomaterials [ 23 ], nanoporous silicon thin films [ 24 ], integrated FET [ 25 ] and carbon nanotubes [ 26 ]. Microtechnologies, in combination with CMOS technologies [ 27 , 28 ], are used not only for the development of hydrogen and hydrogen-containing gas sensors [ 29 ], but also for the detection of other types of gases (e.g., CO [ 13 , 30 ] and NO 2 [ 12 , 31 ]).…”