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A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor

As formaldehyde is an extremely toxic volatile organic pollutant, a highly sensitive and selective gas sensor for low-concentration formaldehyde monitoring is of great importance. Herein, metal-organic framework (MOF) derived Pd/PdO@ZnO porous nanostructures were synthesized through hydrothermal met...

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Autores principales: Khan, Faheem Ullah, Mehmood, Shahid, Liu, Shiliang, Xu, Wei, Shah, Muhammad Naeem, Zhao, Xiaojin, Ma, Junxian, Yang, Yatao, Pan, Xiaofang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8489732/
https://www.ncbi.nlm.nih.gov/pubmed/34616714
http://dx.doi.org/10.3389/fchem.2021.742488
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author Khan, Faheem Ullah
Mehmood, Shahid
Liu, Shiliang
Xu, Wei
Shah, Muhammad Naeem
Zhao, Xiaojin
Ma, Junxian
Yang, Yatao
Pan, Xiaofang
author_facet Khan, Faheem Ullah
Mehmood, Shahid
Liu, Shiliang
Xu, Wei
Shah, Muhammad Naeem
Zhao, Xiaojin
Ma, Junxian
Yang, Yatao
Pan, Xiaofang
author_sort Khan, Faheem Ullah
collection PubMed
description As formaldehyde is an extremely toxic volatile organic pollutant, a highly sensitive and selective gas sensor for low-concentration formaldehyde monitoring is of great importance. Herein, metal-organic framework (MOF) derived Pd/PdO@ZnO porous nanostructures were synthesized through hydrothermal method followed by calcination processes. Specifically, porous Pd/PdO@ZnO nanomaterials with large surfaces were synthesized using MOFs as sacrificial templates. During the calcination procedure, an optimized temperature of 500°C was used to form a stable structure. More importantly, intensive PdO@ZnO inside the material and composite interface provides lots of p-n heterojunction to efficiently manipulate room temperature sensing performance. As the height of the energy barrier at the junction of PdO@ZnO exponentially influences the sensor resistance, the Pd/PdO@ZnO nanomaterials exhibit high sensitivity (38.57% for 100 ppm) at room temperature for 1-ppm formaldehyde with satisfactory selectivity towards (ammonia, acetone, methanol, and IPA). Besides, due to the catalytic effect of Pd and PdO, the adsorption and desorption of the gas molecules are accelerated, and the response and recovery time is as small as 256 and 264 s, respectively. Therefore, this MOF-driven strategy can prepare metal oxide composites with high surface area, well-defined morphology, and satisfactory room-temperature formaldehyde gas sensing performance for indoor air quality control.
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spelling pubmed-84897322021-10-05 A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor Khan, Faheem Ullah Mehmood, Shahid Liu, Shiliang Xu, Wei Shah, Muhammad Naeem Zhao, Xiaojin Ma, Junxian Yang, Yatao Pan, Xiaofang Front Chem Chemistry As formaldehyde is an extremely toxic volatile organic pollutant, a highly sensitive and selective gas sensor for low-concentration formaldehyde monitoring is of great importance. Herein, metal-organic framework (MOF) derived Pd/PdO@ZnO porous nanostructures were synthesized through hydrothermal method followed by calcination processes. Specifically, porous Pd/PdO@ZnO nanomaterials with large surfaces were synthesized using MOFs as sacrificial templates. During the calcination procedure, an optimized temperature of 500°C was used to form a stable structure. More importantly, intensive PdO@ZnO inside the material and composite interface provides lots of p-n heterojunction to efficiently manipulate room temperature sensing performance. As the height of the energy barrier at the junction of PdO@ZnO exponentially influences the sensor resistance, the Pd/PdO@ZnO nanomaterials exhibit high sensitivity (38.57% for 100 ppm) at room temperature for 1-ppm formaldehyde with satisfactory selectivity towards (ammonia, acetone, methanol, and IPA). Besides, due to the catalytic effect of Pd and PdO, the adsorption and desorption of the gas molecules are accelerated, and the response and recovery time is as small as 256 and 264 s, respectively. Therefore, this MOF-driven strategy can prepare metal oxide composites with high surface area, well-defined morphology, and satisfactory room-temperature formaldehyde gas sensing performance for indoor air quality control. Frontiers Media S.A. 2021-09-20 /pmc/articles/PMC8489732/ /pubmed/34616714 http://dx.doi.org/10.3389/fchem.2021.742488 Text en Copyright © 2021 Khan, Mehmood, Liu, Xu, Shah, Zhao, Ma, Yang and Pan. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Khan, Faheem Ullah
Mehmood, Shahid
Liu, Shiliang
Xu, Wei
Shah, Muhammad Naeem
Zhao, Xiaojin
Ma, Junxian
Yang, Yatao
Pan, Xiaofang
A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor
title A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor
title_full A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor
title_fullStr A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor
title_full_unstemmed A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor
title_short A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor
title_sort p-n heterojunction based pd/pdo@zno organic frameworks for high-sensitivity room-temperature formaldehyde gas sensor
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8489732/
https://www.ncbi.nlm.nih.gov/pubmed/34616714
http://dx.doi.org/10.3389/fchem.2021.742488
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