- 标题
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- 实验方案
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Neck-Connected ZnO Films Derived from Core-shell Zeolitic Imidazolate Framework-8 (ZIF-8)@ZnO for Highly Sensitive Ethanol Gas Sensors
摘要： Based on the neck-controlled conduction model of chemiresistive gas sensors, construction of neck-controlled conduction networks in metal oxide films is an efficient method to improve their sensitivity. In this work, we develop a facile route to prepare the neck-connected ZnO (NC-ZnO) films with controllable diameters of the necked part by the sintering of core-shell zeolitic imidazolate framework-8 (ZIF-8)@ZnO films. In order to certify the enhancement of sensitivity by construction of neck-controlled conduction networks, their gas sensing properties towards ethanol are systematically investigated. The results demonstrate that the sensitivity of the optimal NC-ZnO film is dramatically improved, and the response value is about 6-times higher than that of ZnO film, reaching up to 124 (Ig/Ia) towards 50 ppm of ethanol. The results meet our expectation and are in conformity with the neck-controlled conduction model, which further indicates the developed approach in this work is expected to open up a new strategy for the preparation of neck-connected metal oxide films.
关键词： highly sensitive,ZnO,neck-controlled,ZIF-8,gas sensor
更新于2025-09-09 09:28:46
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Design of a Highly-Stable Pillar-Layer Zn(II) Porous Framework for Rapid, Reversible, and Multi-Responsive Luminescent Sensor in Water
摘要： The Hard-Soft-Acid-Base (HSAB) and dual-ligand strategies have been used to construct a pillar-layer luminescent metal–organic framework (MOF) {[Zn2(TRZ)2(DBTDC-O2)]?DMAc}n (1), in which H2DBTDC-O2 = S,S-dioxodibenzothiophen-3,7-dicarboxylic acid and HTRZ = 1,2,4-triazole. Thanks to its high stability in water and quadrangle microporous channels, MOF 1 can be served as a platform of recyclable multi-responsive luminescent sensor for Fe3+, Al3+, SiF6 2–, Cr2O7 2–, nitrofurantoin (NFT), and nitrofurazone (NFZ) in water. This is the first MOF-based sensor for detecting SiF6 2– anion via luminescent enhancement effect. Significantly, 1 also represents a unique example to probe NFZ or NFT by using transition metal MOFs in water, which exhibits the most sensitive sensing ability for NFZ (Ksv = 5.2 × 104 M–1) and NFT (Ksv = 1.8 × 105 M–1) via luminescent quenching.
关键词： Multi-responsive,Metal–organic framework,Water stability,Antibiotics detection,Luminescent sensor
更新于2025-09-09 09:28:46
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Ink-jet printing of a TiO2–10%ZrO2 thin film for oxygen detection using a solution of metal alkoxoacetylacetonates
摘要： A solution of metal alkoxoacetylacetonates in isoamyl alcohol was used as a functional ink for ink-jet printing of TiO2-10%ZrO2 thin nanostructured films. It is shown that the anatase crystal lattice is formed during heat treatment of xerogel thin films in air at a temperature of 500 °C. According to the SEM scanning electron microscopy, the particle size of the resulting films was 10-11 nm. The effect of the number of TiO2-ZrO2 deposited layers on resulting 2D nanomaterial sensitivity to oxygen and other analyte gases (H2, CH4 and CO) at temperatures of 400 and 450 °C is shown.
关键词： Gas sensor,Sol-gel,Titanium dioxide,Additive,Ink-jet printing,Alkoxoacetylacetonate
更新于2025-09-09 09:28:46
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Pd Nanoparticle Film on a Polymer Substrate for Transparent and Flexible Hydrogen Sensor
摘要： Alongside the rise in fully automated equipment and the wearable devices, there is currently a high demand for optically transparent and flexible gas sensors operating at room temperature. Nanoparticle films are ideal H2-sensing materials that can be coupled with flexible substrates because of their discrete nanogranular structure and unique interparticle electrical responsiveness. In this work, we present an optically transparent and flexible H2 sensor based on a Pd nanoparticle film, prepared on a polyethylene terephthalate sheet using a straightforward nanocluster deposition technique. Hundreds of bending cycles demonstrated that the sensor has good electrical stability and mechanical robustness without significant degradation in H2-sensing performance. The H2-sensing behaviors under bent state were systematically evaluated. The loading of tensile and compressive strains under bent state produced a positive and negative influence, respectively, on the sensing performances. The possible influence mechanism of the tensile and compressive strains on H2-sensing performance was attributed to the changes in the percolation network topology and the interparticle space induced by the strains. The ability to detect an H2 concentration as low as 15 ppm, dynamic response range as wide as 0?10% and sub-10 s response time were achieved. In addition, the sensor can be operated in the relative humidity range of 0?90% at room temperature. These results demonstrate that the sensor exhibits significant potential for next-generation transparent and flexible H2 detector.
关键词： flexible,palladium nanoparticle,transparent,hydrogen gas sensor,nanogranular
更新于2025-09-09 09:28:46
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High-Performance 2D MoS <sub/>2</sub> Phototransistor for Photo Logic Gate and Image Sensor
摘要： Two-dimensional (2D) MoS2 is a representative n-type transition-metal dichalcogenide (TMD) semiconductor that has great potential for future nanoscale electronic and optoelectronic applications. Here, we report a high-performance MoS2 phototransistor that exhibits a photoresponse in the 400?700 nm range with the maximum responsivity of over 1 × 104 A/W. As a more sophisticated optoelectronic application than a simple unit device, it is implemented in a photoinverter (NOT logic gate) connected to an external resistor, which clearly shows photoinduced static and dynamic characteristics. Furthermore, we demonstrate a prototype visible imager using the MoS2 photoinverter as imaging pixels as an excellent example of advanced developments in an optoelectronic system based on the 2D semiconductors.
关键词： two-dimensional van der Waals materials,MoS2,image sensor,phototransistor,graphene contact,photoinverter
更新于2025-09-09 09:28:46
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Performance enhance of CMOS-MEMS thermoelectric infrared sensor by using sensing material and structure design
摘要： This study presents the micro thermoelectric infrared sensor consisted of the heat material. Experiment results indicate the Detectivity of proposed design is 2-2.6 fold higher The proposed infrared absorber design has an umbrella-like structure with a post anchor to the TSMC 0.18μm 1P6M standard CMOS process and the in-house post-CMOS MEMS process. (infrared sensor consisted of only the serpentine structure with embedded thermocouple), a transduction absorber and the serpentine structure with embedded thermocouple using the serpentine suspension with embedded thermocouple. As compare with the reference design much higher Seebeck coefficient (56-fold), and is employed in this study as the thermocouple junctions is increased. Moreover, the umbrella-like structure has higher infrared absorption area with and without Silicide are respectively characterized. The poly-Si with no Silicide has a as compare with the serpentine structure. In addition, the Seebeck coefficients of poly-Si films better heat-flow path is achieved and the temperature difference between the hot and cold than that of the reference one at 200mtorr. Experiment also show that the responsivity enhancement of proposed design is further increased as the sensor size is reduced in area.
关键词： thermoelectric,Seebeck effect,thermopile,CMOS-MEMS,infrared sensor
更新于2025-09-09 09:28:46
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Precise gas discrimination with cross-reactive graphene and metal oxide sensor arrays
摘要： Discriminating similar molecules remains a very challenging problem for semiconductor gas sensors. Here, we report a method to achieve precise gas discrimination of similar chemical vapors (mesitylene, o-xylene, and toluene) by using cross-reactive arrays consisting of metal oxide semiconductor and graphene sensors. It is dif?cult to identify these three chemicals as they have very similar responses to these sensors. Through cross-reactive Principal Component Analysis of the sensor response features, however, the discrimination accuracy improved from about 70% with a single gas sensor to almost 100% with the cross-reactive sensor array. Such a precise discrimination and the low-cost planar process make this approach a very attractive candidate for smart gas sensing and for future Internet of Things applications.
关键词： gas discrimination,metal oxide,sensor arrays,cross-reactive,graphene
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE XXVII International Scientific Conference Electronics (ET) - Sozopol, Bulgaria (2018.9.13-2018.9.15)] 2018 IEEE XXVII International Scientific Conference Electronics - ET - Implementation of Internet of Things based solutionof wireless infrared camera with MLX90621 sensor
摘要： In this paper a low-cost solution applicable in the field of continuous monitoring of critical equipment in industry and smart homes is described. It employs a relatively new IR array sensor MLX90621 and implements the IoT concept and three-layer architecture. The implementation of this IoT solution is based on an open source hardware microcontroller development board PIC32-T795 and wireless MOD Wi-Fi ESP8266 module. It is considered to be with reasonable cost and affordable for the potential users. The paper demonstrates the benefits of having an inexpensive infrared sensor as a part of the developed solution for continuous monitoring of critical equipment for overheating.
关键词： Internet of Things,Three layers architecture,Wireless Infrared Camera,IR array sensor
更新于2025-09-09 09:28:46
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High-sensitivity refractive index sensor with tunable detection range based on dual-core resonance effect in gold-coated photonic crystal fibers
摘要： A high-sensitivity refractive index (RI) sensor with wide tunable detection range based on the dual-core resonance of photonic crystal fibers are presented and studied by the finite element method. A cladding air hole coated with gold film is designed as the microfluidic channel for surface plasmon resonance sensing. The channel filled with liquid analyte acts as a defective core. The directional energy coupling between the fiber core and the defective core which determines the sensing performance is greatly influenced by both the RI of the filled liquid and the structural parameters. Numerical results show that the sensitivity of the sensor increases with the increase of the diameter of the analyte channel, and the RI detection range decreases with the increase of this diameter. So we tune the detection range by adjusting the diameter of the analyte channel to meet specific measurement requirements. As the diameter increases from 1.5 μm to 2.4 μm, the detection range shrinks from 1.45–1.62 to 1.45–1.48, both with the high spectral sensitivity 10 392 nm/RIU and 25 040 nm/RIU, respectively. The sensor with wide adjustable detection range shows great advantages in the field of biochemical, chemistry and environmental detection.
关键词： refractive index sensor,photonic crystal fiber,wide detection range,surface plasmon resonance,high-sensitivity
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Polymer/Ag Nanoparticles Composite for Chloroform Detection
摘要： In this paper we report on changes in the extinction spectra of a nanocomposite consisting of Ag nanoparticles arranged into poly(glycidyl methacrylate) host matrix. Two collective surface plasmon modes denoted as P and T were identified in the spectrum. They associated with electric dipoles perpendicular and parallel to the plane of the array respectively. It was found experimentally that intensity and bandwidth of corresponding bands decrease when the nanocomposite is exposed to chloroform vapor. At the same time, both plasmon bands shift toward shorter wavelength. Those dependences can be explained by weakening of the electrodynamic coupling between LSPR in neighboring nanoparticles due to the increase of the distance between particles caused by swelling of the polymer matrix. The spectral changes are fully reversible. It was found that sensitivity of the nanocomposite sensor to chloroform vapor is 0.02 nm/ppm with the response time t=25 s.
关键词： composite,localized surface plasmon resonanse,silver nanoparticles,vapor sensor
更新于2025-09-09 09:28:46