Journal ArticleDOI
Comparative gas-sensing performance of 1D and 2D ZnO nanostructures
TLDR
In this paper, a first approximation of the depletion layer sensing mechanism is used to explain how the geometrical factors of one and two-dimensional nanostructures affect their sensing parameters.Abstract:
In this work we have grown one-dimensional (1D) and two-dimensional (2D) zinc oxide nanostructures. Changing the deposition parameters we were able to obtain ZnO nanowires with an average diameter of 80–250 nm. Nanosheets grown in different conditions show thickness values in the range 70–360 nm. These kinds of nanostructure have been used to fabricate conductometric gas sensors for liquid petroleum gas (LPG) detection. Different sensing parameters are investigated in both cases as a function of the dimensionality and size of the zinc oxide nanostructures. A first approximation of the “depletion layer sensing mechanism” is used to explain how the geometrical factors of one- and two-dimensional nanostructures affect their sensing parameters. The depletion layer affects two dimensions of nanowires and only one of nanosheets. This greatly improves the sensor response of 1D-nanostructures. On the other side two-dimensional nanostructures have a larger cross-section, which increases the base current, thus lowering the limit of detection. At the same operative conditions, nanowires show a better percentage response when compared to similar thickness nanosheets, but 2D nanosheets demonstrate an improved limit of detection (LoD).read more
Citations
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Journal ArticleDOI
Ultra-high sensitive and selective H 2 gas sensor manifested by interface of n–n heterostructure of CeO 2 -SnO 2 nanoparticles
David E. Motaung,David E. Motaung,Gugu H. Mhlongo,Gugu H. Mhlongo,Peter R. Makgwane,Baban P. Dhonge,Franscious Cummings,Hendrik C. Swart,Suprakas Sinha Ray,Suprakas Sinha Ray +9 more
TL;DR: In this paper, the authors reported on the ultra-high sensitive and selective hydrogen gas sensing using CeO2-SnO2 mixed oxide heterostructure synthesized by a simple hydrothermal method.
Journal ArticleDOI
Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications
TL;DR: In this paper, a review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors.
Journal ArticleDOI
Fabrication of ultra-high sensitive and selective CH4 room temperature gas sensing of TiO2 nanorods: Detailed study on the annealing temperature
Zamaswazi P. Tshabalala,Zamaswazi P. Tshabalala,Katekani Shingange,Katekani Shingange,Baban P. Dhonge,Odireleng M. Ntwaeaborwa,Gugu H. Mhlongo,David E. Motaung +7 more
TL;DR: In this paper, the effect of annealing temperature on the sensitivity and selectivity of TiO 2-based sensors for detection of CH 4 gas at room temperature was investigated for underground mining environment.
Journal ArticleDOI
Volatile organic compound sensing based on coral rock-like ZnO
TL;DR: In this paper, the authors presented highly sensitive coral rock-like ZnO to investigate the sensing performances for volatile organic compounds (VOCs), including formaldehyde, methylbenzene, methanol and acetone.
Journal ArticleDOI
Band-gap-tunable CeO2 nanoparticles for room-temperature NH3 gas sensors
TL;DR: In this paper, NH3 was synthesized as NH3 gas sensing materials by simple hydrothermal method and the response time of the sensor is extremely fast (3 s) towards 500ppm NH3 with the response of 22.0 s at room temperature.
References
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Journal ArticleDOI
Vapor‐liquid‐solid mechanism of single crystal growth
R. S. Wagner,W. C. Ellis +1 more
Journal ArticleDOI
Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts
TL;DR: In this article, a single-crystalline SnO2 nanobelts were fabricated using the integrity of a single nanobelt with a sensitivity at the level of a few ppb.
Journal ArticleDOI
Oxide semiconductor gas sensors
TL;DR: In this paper, the three key requirements of sensor design are determined by considering each of these three key factors: selection of a base oxide with high mobility of conduction electrons and satisfactory stability (transducer function), selection of foreign receptor which enhances surface reactions or adsorption of target gas (receptor function), and fabrication of a highly porous, thin sensing body (utility factor).