A fast response &amp; recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit

Li, Zhijie; Huang, Yanwu; Zhang, Shouchao; Chen, Weimei; Kuang, Zhong; Ao, Dongyi; Liu, Wei; Fu, Yong Qing

doi:10.1016/j.jhazmat.2015.07.003

Cited by 223 publications

(97 citation statements)

References 39 publications

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“…7. The details of measurement process of the sensor are similar to those reported in the literature [44]. During the measurement, the working voltage is set as 5 V and the relative humidity is 30%.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Wang

Zhang

et al. 2018

Sensors and Actuators B: Chemical

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155

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Accepted Manuscript Highlights The silica modified CeO2 nanostructures are synthesized using a sol-hydrothermal route and used as NH3 gas-sensing materials. At room temperature, the 8%silica-CeO2 based gas sensor shows high gas response of 3244% to 80 ppm of NH3 and lower detection limit (0.5 ppm) towards NH3 gas. The gas response of the NH3 sensor has good linear characteristics for NH3 gas detecting. The NH3 sensor exhibits good reproducibility, selectivity and long-term stability to NH3 gas. AbstractThe silica modified CeO2 gas sensing nanomaterials are synthesized using a sol-hydrothermal route. The 8%silica-CeO2 has larger specific surface areas of 83.75 m 2 /g and smaller crystalline size of 11.5 nm than pure CeO2, respectively. Compared to pure CeO2, the 8%silica-CeO2 based gas sensor exhibits significant enhancement 2 NH3 gas-sensing performance. At room temperature, it shows much better gas response of 3244% to 80 ppm of NH3 gas and lower detection limit (0.5 ppm) towards NH3 gas. It is also found that the gas response of the NH3 gas sensors increases linearly with the increase of NH3 gas concentration. Moreover, the NH3 gas sensor have good reversibility, stability and selectivity. The reason of enhanced NH3gas-sensing performance is not only because of the increased specific surface areas, but also due to the electrolytic conductivity of NH4 + and OH -on the surface.

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Section: Gas Sensing Propertiesmentioning

confidence: 99%

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Wang

Zhang

et al. 2018

Sensors and Actuators B: Chemical

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155

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“…Generally, the type of absorbed oxygen species is determined by the operating temperature, and O 2− becomes the main form of oxygen species at the operating temperature of 400 °C 31 . When the PbS sensor contacts with the air, oxygen molecules in the air will adsorb on the surfaces of the PbS sensor and trap electrons from the conduction band of the PbS sensor, forming oxygen species (O -, O 2 -, O 2-) (Eqs.…”

Section: Gas-sensing Mechanism Of Pbs Sensormentioning

confidence: 99%

Synthesis of Star-Shaped Lead Sulfide (PbS) Nanomaterials and theirs Gas-Sensing Properties

et al. 2016

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Star-shaped PbS nanomaterials are synthesized by a hydrothermal method. Morphology and structure of the PbS nanomaterials are analyzed by SEM, HRTEM and XRD. Gas-sensing properties of the as-prepared PbS sensor are also systematically investigated. The results show star-shaped PbS nanostructure consists of four symmetric arms in the same plane and demonstrate good crystallinity. With the increase of ethanol concentration, the sensitivity of the PbS sensor significantly increases and demonstrates an almost linear relationship at the optimal operating temperature of 400 o C. Moreover, the fast response-recovery towards ethanol is also observed, which indicates its great potential on ethanol detection.

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“…Zheng and co-workers [14] reported the ionothermal synthesis of α-Fe 2 O 3 nanochains and its use in resistive hydrogen sulfide sensors. Similarly, Li and co-workers [15] employed α-Fe 2 O 3 nanoparticles for detecting H 2 S at the ppm level. The sensing mechanism consists of H 2 S altering the equilibrium concentration of oxygen adsorbates present at the surface of the iron oxide nanomaterial.…”

Section: Metal Oxide Nanomaterialsmentioning

confidence: 99%

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Llobet

Brunet

Pauly

et al. 2017

Sensors

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This paper presents a focused review on the nanomaterials and associated transduction schemes that have been developed for the selective detection of hydrogen sulfide. It presents a quite comprehensive overview of the latest developments, briefly discusses the hydrogen sulfide detection mechanisms, identifying the reasons for the selectivity (or lack of) observed experimentally. It critically reviews performance, shortcomings, and identifies missing or overlooked important aspects. It identifies the most mature/promising materials and approaches for achieving inexpensive hydrogen sulfide sensors that could be employed in widespread, miniaturized, and inexpensive detectors and, suggests what research should be undertaken for ensuring that requirements are met.

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A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit

Cited by 223 publications

References 39 publications

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Synthesis of Star-Shaped Lead Sulfide (PbS) Nanomaterials and theirs Gas-Sensing Properties

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

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