First Fifty Years of Chemoresistive Gas Sensors

Neri, G.

doi:10.3390/chemosensors3010001

Cited by 422 publications

(281 citation statements)

References 88 publications

(84 reference statements)

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“…Metal oxides (MOX)-Over the past five decades, gas sensors based on semiconducting metal oxides have drawn much attention [14]. Initially, three dimensional materials were used, which were later replaced by two dimensional materials because of their superior gas sensing performances.…”

Section: Factors Influencing the Gas Sensing Characteristics Of Thinmentioning

confidence: 99%

“…The sensing mechanism of conductive sensors relies on the charge transfer which occurs between the sensing layer and surface chemisorbed species. Such a charge transfer affects the electrical resistance of the sensitive material, representing the response of the sensor [14]. Generally, for LHDs or MOX chemoresistive sensors, the presence of oxygen is crucial for this mechanism, because electron transfer occurs through chemisorption of the oxygen reactive species O2 − , O − , O 2− , which react with the chemisorbed target gases [24].…”

Section: Factors Influencing the Gas Sensing Characteristics Of Thinmentioning

confidence: 99%

“…A lot of excellent books/reviews on conductometric sensors have been published; the reader is referred to those cited in the review reported in ref. [14]. The sensing mechanism of conductometric gas sensors relies on the change in resistance after the interaction and charge-transfer of the gas target with the surface of the sensitive layer [39].…”

Section: Gas Sensing Properties Of Thin 2d Inorganic Materialsmentioning

confidence: 99%

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Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

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112

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Abstract:Since the first report of graphene, thin two-dimensional (2D) nanomaterials with atomic or molecular thicknesses have attracted great research interest for gas sensing applications. This was due to the distinctive physical, chemical, and electronic properties related to their ultrathin thickness, which positively affect the gas sensing performances. This feature article discusses the latest developments in this field, focusing on the properties, preparation, and sensing applications of thin 2D inorganic nanomaterials such as single-or few-layer layered double hydroxides/transition metal oxides/transition metal dichalcogenides. Recent studies have shown that thin 2D inorganic nanomaterials could provide monitoring of harmful/toxic gases with high sensitivity and a low concentration detection limit by means of conductometric sensors operating at relatively low working temperatures. Promisingly, by using these thin 2D inorganic nanomaterials, it may open a simple way of improving the sensing capabilities of conductometric gas sensors.

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Section: Factors Influencing the Gas Sensing Characteristics Of Thinmentioning

confidence: 99%

Section: Factors Influencing the Gas Sensing Characteristics Of Thinmentioning

confidence: 99%

Section: Gas Sensing Properties Of Thin 2d Inorganic Materialsmentioning

confidence: 99%

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Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

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112

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“…Among various types of gas sensors, semiconductor metal oxide (SMO) gas sensors are suitable for mobile applications due to their small size, low cost and high sensitivity. 1 However, they usually need high operation temperatures ranging from 200 °C to 400 °C, requiring high electrical power for heating. In order to reduce the operating power, researchers have tried to combine micro-heating platforms and sensing nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Cho

Kang

Yang

et al. 2017

ACS Appl. Mater. Interfaces

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KEYWORDSmetal oxide, gas sensor, MEMS, tin oxide (SnO2), nanowire, nanotube, liquid phase deposition ABSTRACTWe have developed highly sensitive, low power gas sensors through the novel integration method of porous SnO2 nanotubes (NTs) on a micro-electro-mechanical-systems (MEMS) platform. As a template material, ZnO nanowires (NWs) were directly synthesized on beamshaped, suspended microheaters through in-situ localized hydrothermal reaction induced by 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 local thermal energy around the Joule-heated area. Also, liquid phase deposition (LPD) process enabled the formation of porous SnO2 thin film on the surface of ZnO NWs and simultaneous etching of ZnO core, eventually to generate porous SnO2 NTs. Due to the localized synthesis of SnO2 NTs on the suspended microheater, very low power for the gas sensor operation (< 6 mW) has been realized. Moreover, sensing performance (e.g. sensitivity and response time) of synthesized SnO2 NTs was dramatically enhanced compared to those of ZnO NWs. In addition, the sensing performance was further improved by forming SnO2-ZnO hybrid nanostructures due to the heterojunction effect.

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“…Nowadays, modern technology is demanding more efficient gas sensors for advanced applications [1]. Consequently, there is a considerable effort towards the goal of high performance gas sensors based on novel sensing materials.…”

Section: Introductionmentioning

confidence: 99%