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Grain boundary-induced drastic sensing performance enhancement of Fe_(2)O_(3) gas sensors for acetone

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Rare Metals 2024年第9期43卷 4412-4424页

作者： Tian-Jun Hu Yi-Fan Li Yu-Zhu Tian Ying Wang Ya-Ru Chen Jun-Ming Zhang Er-Gui Luo Jian-Feng Jia Key Laboratory of Magnetic Molecules&Magnetic Information Materials Ministry of Education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030032China

Exploring the structure-activity relationship between the performance of gas sensors and the structure of semiconductor metal oxide(SMO)nanomaterials is crucial for understanding and designing gas-sensing materials and overcoming the application limitations of SMO-based gas *** of a single SMO microstructure provides a promising solution to address this scientific problem due to its controllable *** this study,we control the grain boundary(GB)density of Fe_(2)O_(3)nanomaterials using a simple solvothermal *** have similar chemical compositions and crystal phases,providing an ideal platform for studying the influence of the GB density on the gas-sensing ***-sensing tests showed that the Fe_(2)O_(3)-1 sensor with medium GB density and the Fe_(2)O_(3)-2 sensor with high GB density had higher sensitivity and selectivity than the Fe_(2)O_(3)-0 sensors with low GB density before reaching the optimal operating ***,when the GB density increased,the response to acetone decreased slightly,whereas the optimal operating temperature *** work highlights the unique performance of the GB density in enhancing the gas sensitivity of a single SMO.

关键词： Semiconductor metal oxide(SMO) Grain boundary(GB)density Oxygen adsorption Charge transfer gas sensors

Interconnected graphene scaffolds for functional gas sensors with tunable sensitivity

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Journal of Materials Science & Technology 2020年第23期58卷 16-23页

作者： Xiao You Jinshan Yang Mengmeng Wang Hongda Wang Le Gao Shaoming Dong State Key Laboratory of High Performance Ceramics&Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China University of Chinese Academy of Sciences Beijing100039China

In this work,the interconnected graphene scaffolds are prepared by three-dimensional(3 D)printing for multifunctional gas detection with tunable *** scaffolds with regularly aligned graphene conductive networks exhibit significant mechanical strength and high electrical stability to multi-direction deformation,which can be attributed to the typical core-shell structure of graphene and *** resistance of the free-standing scaffolds can realize the real-time response to H_(2) O and NO_(2),and the relative resistance change to 100 ppm H_(2) O and 100 ppm NO_(2) can reach 2%and 2.5%,*** charge doping of the oxidizing gases is considered to be the main reason for various response sensitivities of the scaffolds with different orthogonal layers,in which the interconnected conductive network can generate a large specific surface area and significantly improving the adsorption of the target gases and the transfer of *** controllable fabrication of regular structure has appropriately great potential for further optimizations and applications in gas detection.

关键词： Graphene scaffolds Interconnected network 3D printing gas sensors Multifunctional gas detection

Strategies and challenges for enhancing performance of MXene-based gas sensors:a review

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Rare Metals 2022年第12期41卷 3976-3999页

作者： Hai-Feng Zhang Jing-Yue Xuan Qi Zhang Mei-Ling Sun Fu-Chao Jia Xiao-Mei Wang Guang-Chao Yin Si-Yu Lu School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China

With the advantages of metal conductivity,large specific surface area,and rich surface functional groups,two-dimensional(2D)MXenes have shown great potential in the field of gas ***,gas sensors fabricated with pristine MXenes generally suffer from several problems such as low sensitivity,poor selectivity,significant baseresistance drift,and poor environment ***,many efforts have been devoted to overcoming these *** this review,we review the progress on MXenebased gas sensors and summarize several efficient strategies(including structural design,surface modification,inorganic Schottky j unction/heterojunction sensitization,polymer addition,and metal-ion intercalation)to promote the gassensing *** addition,the major challenges and future development directions of MXene-based gas sensors are also outlined in the present review.

关键词： MXenes gas sensors Strategies gas-sensing performance

ZnO Nanoparticles as Ethanol gas sensors and the Effective Parameters on Their Performance

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Journal of Materials Science & Technology 2013年第5期29卷 393-400页

作者： Asieh Sadat Kazemi Reza Afzalzadeh Mohamadreza Abadyan Bojnourd Branch Islamic Azad UniversityBojnourdIran School of Physics Khajeh Nasir Toosi University of TechnologyTehranIran Shahrekord Branch Islamic Azad UniversityShahrekordIran

ZnO nanoparticles are synthesized and applied as ethanol gas sensors. In some cases, the sensitivity and response time of these particles are shown to be higher than that has been reported in the literature. It has been investigated that the most possible reason for this higher gas sensing performance can be attributed to the quantity of the activity coefficient of its initial components. However, other effects such as pH and thermal decomposition are of importance as well. Specific ion interaction （SIT） model is applied to derive the mean activity coefficient values of the additives used in synthesis of ZnO nanoparticles.

关键词： ZnO nanoparticles gas sensors Activity coefficient pH Thermal decomposition

Two-dimensional transition metal MXene-based gas sensors:A review

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Chinese Chemical Letters 2024年第1期35卷 208-221页

作者： Junfeng Li Xiaojie Chen Xiaojie Zhu Yingchang Jiang Xueting Chang Shibin Sun College of Logistics and Engineering Shanghai Maritime UniversityShanghai 201306China Institute of Marine Materials Science and Engineering Shanghai Maritime UniversityShanghai 201306China

As an emerging star in the family of two-dimensional(2D)materials,2D transition metal carbides,carbonitrides and nitrides,collectively referred to as MXenes,have large specific surface area,rich active sites,metallic conductivity and adjustable surface chemical *** features make MXenes promising candidates for gas-sensing *** the past few years,MXene-based sensors have drawn increasing attention due to their enhanced sensor *** on this,this review systematically represents the structure,synthesis methods and properties of MXenes,and summarizes their applications in gas ***,the types,structure,main synthesis methods and properties of MXenes are introduced in a comprehensive ***,the corresponding design principle and working mechanism of MXene-based gas sensor are ***,the sensing performances of pristine MXenes and the MXene-based nanocomposite are ***,some future opportunities and challenges of MXene-based sensors are pointed out.

关键词： MXene gas sensors Synthesis Stability gas-sensing mechanism gas-sensing performance

Photonic gas sensors exploiting directly the optical properties of hybrid carbon nanotube localized surface plasmon structures

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Light(Science & Applications) 2016年第1期5卷 624-631页

作者： Thomas Allsop Raz Arif Ron Neal Kyriacos Kalli Vojtěch Kundrát Aleksey Rozhin Phil Culverhouse David J Webb Aston Institute of Photonic Technologies School of Engineering and Applied ScienceAston UniversityAston TriangleBirmingham B47ETUK Nanoscience Research Group School of Engineering and Applied ScienceAston UniversityAston TriangleBirmingham B47ETUK Physics Department Faculty of ScienceUniversity of SulaimaniSulaimaniIraq-Kurdistan Region Faculty of Science and Technology School of MathsComputing and RoboticsUniversity of PlymouthPlymouth PL48AAUK Department of Electrical Engineering Computer Engineering and InformaticsCyprus University of TechnologyLimassol 3036Cyprus

Weinvestigate the modification of the optical properties of carbon nanotubes(CNTs)resulting from a chemical reaction triggered by the presence of a specific compound(gaseous carbon dioxide(CO_(2)))and show this mechanism has important consequences for chemical *** have attracted significant research interest because they can be functionalized for a particular chemical,yielding a specific physical response which suggests many potential applications in the fields of nanotechnology and *** far,however,utilizing their optical properties for this purpose has proven to be *** demonstrate the use of localized surface plasmons generated on a nanostructured thin film,resembling a large array of nano-wires,to detect changes in the optical properties of the *** selectivity is demonstrated using CO_(2) in gaseous form at room *** demonstrated methodology results additionally in a new,electrically passive,optical sensing configuration that opens up the possibilities of using CNTs as sensors in hazardous/explosive environments.

关键词： carbon nanotubes gas sensors localized surface plasmons optical sensing

Metal Oxide Nanocrystals Multi-Parametric gas sensors

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稀有金属材料与工程 2006年第A3期35卷 17-20页

作者： E.Comini C.Baratto M.Ferroni G.Faglia G.Sberveglieri Sensor CNR-INFMBrescia UniversityVia Valotti 925133 BresciaItaly

Interest in nanowires of semiconducting oxides is exponentially grown in the last years,due to their attracting potential applications in electronic,optical and sensor *** have focused our attention on the sensing properties of indium and zinc oxide *** have studied the influence of the deposition conditions on the nanostructures morphology and sensing *** report on the growth of ZnO and In_2O_3 nanostructures on silicon and alumina substrates,using vapour phase *** have synthesized,depending on the growth conditions,different structures such as nano-wires, tetrapod,nano-comb,nano-necklace,nano-pencil ZnO/In_2O_3 without using any metal catalyst.

关键词： indium oxide zin oxide gas sensors photoluminescence nanowires

β-Ga_(2)O_(3) nanowires and thin films for metal oxide semiconductor gas sensors:Sensing mechanisms and performance enhancement strategies

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Journal of Materiomics 2019年第4期5卷 542-557页

作者： Adeel Afzal Dipartimento di Chimica Universita degli Studi di Bari“Aldo Moro”Via Orabona 470126BariItaly Department of Chemistry College of ScienceUniversity of Hafr Al BatinPO Box 1803Hafr Al Batin39524Saudi Arabia

The reliable,selective,and fast detection of the inorganic and organic gases in indoor and outdoor air and industrial processes is a huge challenge for environmental sustainability,healthier life,and disease control and *** oxides have been frequently explored as highly sensitive receptor elements in the electronic gas sensors since the *** oxide(Ga_(2)O_(3)),often recognized as one of the widest-bandgap semiconductors,has shown tremendous potential as the inorganic gas receptor because of its extraordinary chemical and thermal stability,and excellent electronic *** article presents a comprehensive reference on the electrical properties,historical developments,detection mechanisms,and gas sensing performance of Ga_(2)O_(3) nanowires and composite *** particular,the relationships between composition,nanostructure,and gas sensing properties of galliumcontaining oxidic nanomaterials such as β-Ga_(2)O_(3) nanowires,surface-modified Ga_(2)O_(3),metal-doped Ga_(2)O_(3) or Ga-doped metal oxides,and Ga_(2)O_(3)/metal oxide composite heterostructures are *** applications of Ga_(2)O_(3) gas sensors are discussed with an emphasis on their practical limitations such as high-temperature operation,power consumption,and miniaturization ***,future research directions and potential developments are suggested.

关键词： β-Ga_(2)O_(3)nanowires gas sensors Nanomaterials Semiconductors Sensing mechanisms Thin films

Nanofibers enabled advanced gas sensors:A review

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Advanced Sensor and Energy Materials

Advanced Sensor and Energy Materials 2024年第2期3卷 24-40页

作者： Kening Lang Tianyi Liu Daniel J.Padilla Marriana Nelson Christopher W.Landorf Rishi J.Patel Mark L.Ballentine Alan J.Kennedy Wu-Sheng Shih Adam Scotch Jiadeng Zhu Smart Devices Brewer Science Inc.SpringfieldMO 65806United States Jordan Valley Innovation Center Missouri State UniversitySpringfieldMO 65806United States U.S.Army Corps of Engineers Engineer Research and Development Center3909 Halls Ferry RoadVicksburgMS 39180United States

The advancement of gas sensor technology over the past decades has led to remarkable progress and achievements in pollution control and environmental *** with other sensing materials,electrospun nanofibers have attracted significant attention,which is mainly due to their unique characteristics,including but not limited to high surface area,easy structure design,facile facility setup,multifunctional properties,etc.,making them outstanding candidates for potential applications in this *** review provides an overview of the applications of electrospun nanofibers in gas sensors,concentrating on carbon monoxide,hydrogen,carbon dioxide,hydrogen sulfide,ammonia,nitrogen oxides,oxygen,and volatile organic *** begins with a brief introduction to sensing materials and the advantages of electrospun nanofibers along with their ongoing *** principles and progress of electrospinning are then ***,the corresponding properties of electrospun nanofibers in diverse gas sensors are thoroughly ***,a future vision regarding challenges and perspectives in this area is *** review provides an extensive and comprehensive reference to utilize advanced electrospun nanofibers to generate novel sensors,facilitating their performance in high-demand areas.

关键词： Nanofibers gas sensors Electrospinning Structure design Environmental protection