A fast-response/recovery ZnO hierarchical nanostructure based gas sensor with ultra-high room-temperature output response

Pan, Xiaofang; Zhao, Xiaojin; Chen, Jiaqi; Bermak, Amine; Fan, Zhiyong

doi:10.1016/j.snb.2014.08.089

Cited by 88 publications

(33 citation statements)

References 53 publications

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“…In order to measure the top and bottom surface temperatures of metal thermal resistance layer, the other metals are connected to the top and bottom surfaces of the metal thermal resistance layer, and the two metal thermal resistance layers are connected with the wires made by same materials, respectively. And the temperature of other end for the wire remains constant, which can be considered as the reference end, and then the contact points locate at the interface of metal thermal resistance layer of thermocouple [12]. The top and bottom interface temperatures of metal thermal resistance layer can be conversed by measured voltage between two metal wires, and the basic structure of fast response sensor for measuring temperature field of internal combustion engine is shown in Fig.…”

Section: Basic Theory Of Fast Response Sensormentioning

confidence: 99%

Heat transfer analysis of fast response sensor for internal combustion engine based on Coiflet wavelet finite element method

Zhao

Han

Shi

et al. 2017

J Therm Anal Calorim

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The fast response temperature sensor is an effective tool for measuring the temperature of internal combustion engine, in order to improve the performance of fast response temperature sensor, and the Coiflet wavelet finite element method is applied in analyzing the heat transfer rules of fast response temperature sensor. Firstly, the related research progress on the performance analysis of fast response and wavelet finite element method is summarized, respectively, and research significance of heat transfer of fast response sensor based on Coiflet wavelet finite element method is summarized in detail. Secondly, the basic theory of fast response sensor is studied, and the new structure of the fast response temperature sensor is analyzed. Thirdly, the Coiflet wavelet finite element model of analyzing heat transfer of fast response sensor is constructed by combing the Coiflet wavelet scale function with traditional finite element method, and the theoretical models are deduced. Finally, the heat transfer simulation of fast response temperature sensor based on Coiflet wavelet finite element method is carried out, and simulation results show that the Coiflet finite element has higher computing precision and efficiency than traditional finite element method, and the heat transfer rules of fast response temperature sensor are also obtained.Keywords Coiflet wavelet finite element Á Heat transfer Á Fast response temperature sensor During the working process of the internal combustion engine, the temperature and pressure of the low-temperature working media can increase through the combustion of mixture refrigerant concluding air and petroleum fuels, and then the working media can do expansion work. In the process of combustion, the temperature of the working medium will suddenly increase, and the process time should be measured in seconds. Because temperature changes rapidly, the general temperature sensor has difficulty measuring the temperature of the working medium accurately, and therefore the fast response temperature sensor should be used. Currently, there are many sensors; however, these sensors have many disadvantages when they are used to measure the temperature of the internal combustion engine; for example, the platinum resistance thermometer has low response speed and big volume, the thermistor is volatile in high temperature, and the radiation thermometer is not suitable for measuring the temperature of closed cavity. Therefore, the new fast speed sensor should be used to measure the temperature of internal combustion engine, which has fast response when it is used to measure temperature of internal combustion engine. However, the temperature change in fast response sensor has strong nonlinearity when it is used to measure temperature of internal combustion engine, and therefore the advanced numerical analysis method should be used to analyze the temperature of fast response sensor. The wavelet finite element method has the characteristic of multi-resolution analysis, and the complex degree of nonlinear analys...

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Section: Basic Theory Of Fast Response Sensormentioning

confidence: 99%

Heat transfer analysis of fast response sensor for internal combustion engine based on Coiflet wavelet finite element method

Zhao

Han

Shi

et al. 2017

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…The first ZnO wire gas sensor was successfully fabricated by Wan et al in 2004 [7]. Subsequently, nanorods [10][11][12][13], -wires [14][15][16], -belts [17,18], -tubes [19], -flakes [20], -prism [21], -walls [22], hollow spheres [23], porous nanosheets [24], hierarchical nanostructure [8,[25][26][27] and hierarchical nanostructure assembled from porous nanosheets [9,28,29] of ZnO were employed to fabricate sensors for detection of C 2 H 5 OH [7,19,20,26,27], H 2 S [10,11], H 2 [12,14], NH 3 [15,16], N(C 2 H 5 ) 3 [16,30], O 2 [17], CO [18], NO 2 [21,24,25], C 6 H 5 Cl [9] and CH 3 OH [28]. The ZnO nanodisks with dominant {0001} facets were found to exhibit far better gas-sensing performance for NH 3 , N(C 2 H 5...…”

Section: Introductionmentioning

confidence: 99%

Responses of three-dimensional porous ZnO foam structures to the trace level of triethylamine and ethanol

Wang

Chen

Cheng

et al. 2016

Sensors and Actuators B: Chemical

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“…As an n ‐type metal oxide semiconductor with a wide band gap of 3.37 eV, ZnO has been reported as an effective material to recognize different gases due to its high electrical conduction ability as well as its excellent thermal stability . Various ZnO nano/microstructures have been utilized to fabricate gas sensors, such as 1D nanorods and nanowires, 2D nanosheets or nanoplates, and 3D hierarchical structures . Two key factors facilitate the gas sensing performances: high surface area and facile mass transport .…”

Section: Introductionmentioning

confidence: 99%

Atomic Layer Deposition on Block Copolymer Membranes with Gyroidal Nanopores Toward Periodically Nanostructured Vapor Sensors: Nanotubes versus Nanorods

Guo

Zhong

Wang

2016

Adv Materials Inter

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Both the template itself and the replicating technique determine the structures and consequently the performances of the produced replica. Recently, block copolymers (BCPs) as the templates and atomic layer deposition (ALD) as the replicating technique have been demonstrated to be a very promising pair in the template synthesis of a variety of porous materials with various functions. BCPs are composed of two or more covalently linked homopolymer chains. Microphase separation of the incompatible constituent blocks occurs, leading to a number of well-organized periodic morphologies. In these phase-separated morphologies, the minority blocks forming spheres, cylinders, gyroids, lamellae, and etc. are uniformly distributed in the matrix of the majority blocks. [ 9 ] By converting the dispersed phases in the BCPs into voids via chemical or physical methods, one produces porosities along the positions initially occupied by the minority phases without the loss of the size uniformity. [10][11][12] Thus obtained porous polymers can then be used as templates containing highly ordered pores with sizes typically in the range ≈10-50 nm. [ 13,14 ] ALD defi ned as selflimiting reactions of gaseous precursors along the solid interfaces is capable of forming conformal thin coating layers on substrate surfaces with precise control of the coating thickness in the subangstrom level. [ 15 ] ALD is particularly superior in the coating of narrow and deep pores with high aspect ratios as its precursors are operated always in the vaporized form, thus being able to be delivered into pores as small as comparable to the sizes of the precursor molecules themselves, and form monolayers along the pore walls. [ 16 ] To synergize the distinguished properties of both BCP templates and ALD replication, BCP templates with porosities in the form of spirals, [ 17 ] straight cylinders, [ 18 ] gyroids, [ 19,20 ] three-dimensionally interconnected disordered channels [ 21,22 ] have been coated with ZnO, Al 2 O 3 , or TiO 2 by ALD, and replica composed of tubular building blocks are produced after removing the BCP templates by calcination or dissolution. The produced replica of metal oxides shows excellent performances as humidity sensors, antirefl ection coatings, and photovoltaics because of their well-controlled uniform structures endowed jointly by the BCP templates and ALD replication. Considering that a number of pore geometries 3D gyroidal networks of ZnO nanorods or nanotubes are synthesized by replicating block copolymer (BCP) templates with gyroidal nanopores via atomic layer deposition (ALD). The generation of 3D ZnO nanorods or nanotubes depends on the thicknesses of deposited ZnO layers, which can be easily and precisely controlled by adjusting ALD cycles. The as-obtained ZnO nanostructures have porosities as high as 77% for gyroidal nanorods and 86% for gyroidal nanotubes due to their unique interconnected structures and rough surfaces. Both gyroidal ZnO nanostructures are used as vapor sensors to detect ethanol with different concentration...

show abstract

A fast-response/recovery ZnO hierarchical nanostructure based gas sensor with ultra-high room-temperature output response

Cited by 88 publications

References 53 publications

Heat transfer analysis of fast response sensor for internal combustion engine based on Coiflet wavelet finite element method

Heat transfer analysis of fast response sensor for internal combustion engine based on Coiflet wavelet finite element method

Responses of three-dimensional porous ZnO foam structures to the trace level of triethylamine and ethanol

Atomic Layer Deposition on Block Copolymer Membranes with Gyroidal Nanopores Toward Periodically Nanostructured Vapor Sensors: Nanotubes versus Nanorods

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