Enhancement of Ammonia Gas Sensing Properties of GaAs-Based Schottky Diodes Using Ammonium Sulfide Surface Passivation

Mahmoodnia, Hedieh; Salehi, Alireza; Mastelaro, Valmor Roberto

doi:10.1109/jsen.2020.3029953

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…In addition to element doping, constructing heterojunction nanostructures including nn, n-p, or Schottky-type [12,54,55,[105][106][107] between two different materials is a fascinating way of regulating the band structure and energy levels and then improving the sensor response and recovery.…”

Section: Heterojunctionmentioning

confidence: 99%

Accelerating the Gas–Solid Interactions for Conductometric Gas Sensors: Impacting Factors and Improvement Strategies

2023

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Metal oxide-based conductometric gas sensors (CGS) have showcased a vast application potential in the fields of environmental protection and medical diagnosis due to their unique advantages of high cost-effectiveness, expedient miniaturization, and noninvasive and convenient operation. Of multiple parameters to assess the sensor performance, the reaction speeds, including response and recovery times during the gas–solid interactions, are directly correlated to a timely recognition of the target molecule prior to scheduling the relevant processing solutions and an instant restoration aimed for subsequent repeated exposure tests. In this review, we first take metal oxide semiconductors (MOSs) as the case study and conclude the impact of the semiconducting type as well as the grain size and morphology of MOSs on the reaction speeds of related gas sensors. Second, various improvement strategies, primarily including external stimulus (heat and photons), morphological and structural regulation, element doping, and composite engineering, are successively introduced in detail. Finally, challenges and perspectives are proposed so as to provide the design references for future high-performance CGS featuring swift detection and regeneration.

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Section: Heterojunctionmentioning

confidence: 99%

Accelerating the Gas–Solid Interactions for Conductometric Gas Sensors: Impacting Factors and Improvement Strategies

2023

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“…They confirmed that the sensor has different responses for the same gas under different V GS . In a methanol atmosphere of 150 ppm at 100 °C, the sensitivity of the sensor is 1.95% at V GS =0 V. When V GS is 5 V and 13 V, the response of the sensor is 127.93% and 82.38%, respectively [50] Mahmoodnia et al demonstrated a GaAs-based Schottky junction gas sensor, and saturated ammonium sulfide solution was used to passivate the GaAs [53]. The barrier height of the GaAs gas sensor after passivation has changed from 0.688 eV to 0.758 eV.…”

Section: Resistor-type Gas Sensorsmentioning

confidence: 99%

“…At 150 °C, the responsivity of the passivated GaAs gas sensor to 600 ppm ammonia gas increased significantly from 26% to 63%. In addition, its response time and recovery time are also greatly reduced [53].…”

Section: Resistor-type Gas Sensorsmentioning

confidence: 99%

Gas sensing devices based on two-dimensional materials: a review

Wang

Chen

et al. 2022

Nanotechnology

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Gas sensors have been widely utilized penetrating every aspect of our daily lives, such as medical industry, environmental safety testing, and the food industry. In recent years, two-dimensional (2D) materials have shown promising potential and prominent advantages in gas sensing technology, due to their unique physical and chemical properties. In addition, the ultra-high surface-to-volume ratio and surface activity of the 2D materials with atomic-level thickness enables enhanced absorption and sensitivity. Till now, different gas sensing techniques have been developed to further boost the performance of 2D materials-based gas sensors, such as various surface functionalization and Van der Waals heterojunction formation. In this article, a comprehensive review of advanced gas sensing devices is provided based on 2D materials, focusing on two sensing principles of charge-exchange and surface oxygen ion adsorption. Six types of typical gas sensor devices based on 2D materials are introduced with discussion of latest research progress and future perspectives.

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Design strategies of semiconductor sensors toward ammonia monitoring in smart agriculture

Wang,

Cao,

Zhang

et al. 2024

Journal of Environmental Chemical Engineering

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Enhancement of Ammonia Gas Sensing Properties of GaAs-Based Schottky Diodes Using Ammonium Sulfide Surface Passivation

Cited by 3 publications

References 30 publications

Accelerating the Gas–Solid Interactions for Conductometric Gas Sensors: Impacting Factors and Improvement Strategies

Accelerating the Gas–Solid Interactions for Conductometric Gas Sensors: Impacting Factors and Improvement Strategies

Gas sensing devices based on two-dimensional materials: a review

Design strategies of semiconductor sensors toward ammonia monitoring in smart agriculture

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