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Flexible gas sensor

Xiaoqing Qi, Zihao Lu, En-Ming You, Yuan He, Qin-E Zhang, Han-Jing Yi, Danyang Li, Song-Yuan Ding, Yuan Jiang, Xiaopeng Xiong, Jun Xu, Dongtao Ge, Xiang Yang Liu, Hua Bai
The fabrication of thin films comprising ordered nanowire assemblies with emerging, precisely defined properties and adjustable functionalities enables highly integrated technologies in the fields of microelectronics and micro system technology, as well as for efficient power generation, storage, and utilization. Shear force, theoretically, is deemed as the most promising method for obtaining in-plane, uniaxial thin films comprising nanowires. The success depends largely on the assembly process, and uniform structural control throughout multiple length scales can be achieved only if the rational strategy is executed...
December 13, 2018: ACS Nano
Bo Xie, Peng Mao, Minrui Chen, Zhaoguo Li, Juanjuan Han, Lun Yang, Xiuzhang Wang, Min Han, Jun-Ming Liu, Guanghou Wang
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...
December 4, 2018: ACS Applied Materials & Interfaces
Lili Wang, Shuai Chen, Wei Li, Kang Wang, Zheng Lou, Guozhen Shen
The development of materials with high efficiency and stable signal output in a bent state is important for flexible electronics. Grain boundaries provide lasting inspiration and a promising avenue for designing advanced functionalities using nanomaterials. Combining bulk defects in polycrystalline materials is shown to result in rich new electronic structures, catalytic activities, and mechanical properties for many applications. However, direct evidence that grain boundaries can create new physicochemical properties in flexible electronics is lacking...
November 28, 2018: Advanced Materials
Ye Mu, Tianli Hu, He Gong, Ruiwen Ni, Shijun Li
In this study, tunable diode laser absorption spectroscopy (TDLAS) combined with wavelength modulation spectroscopy (WMS) was used to develop a trace C₂H₂ sensor based on the principle of gas absorption spectroscopy. The core of this sensor is an interband cascade laser that releases wavelength locks to the best absorption line of C₂H₂ at 3305 cm-1 (3026 nm) using a driving current and a working temperature control. As the detected result was influenced by 1/ f noise caused by the laser or external environmental factors, the TDLAS-WMS technology was used to suppress the 1/ f noise effectively, to obtain a better minimum detection limit (MDL) performance...
October 19, 2018: Micromachines
Xiaoxia Xu, Lei Gao, Guotao Duan
A convenient and flexible route is presented to fabricate gold noble metal nanoparticles wrapped with a controllable ultrathin carbon layer (Au@C) in one step based on laser ablation of the noble metal targets in toluene-ethanol mixed solutions. The obtained metal nanoparticles were <20 nm in size after ablation, and the thickness of the wrapped ultrathin carbon layer was 2 nm in a typical reaction. The size of the inner noble metal nanoparticles could be controlled by adjusting the power of laser ablation, and the thickness of the ultrathin carbon layer can be controlled from 0...
June 1, 2018: Micromachines
Chang-Jin Lim, Soyeon Lee, Jin-Hoon Kim, Hye-Jun Kil, Yu-Chan Kim, Jin-Woo Park
We present a new concept for a wearable oxygen (O2 ) sensor for transcutaneous O2 pressure (tcpO2 ) monitoring by combining the technologies of luminescent gas sensing and wearable devices. O2 monitoring has been exhaustively studied given its central role in diagnosing various diseases. The ability to quantify the physiological distribution and real-time dynamics of O2 from the subcellular to the macroscopic level is required to fully understand mechanisms associated with both normal physiological and pathological conditions...
November 16, 2018: ACS Applied Materials & Interfaces
Ji-Sun Park, Taek-Young Youn, Hye-Bin Kim, Kyung-Hyune Rhee, Sang-Uk Shin
Internet of Things (IoT)-based devices, especially those used for home automation, consist of their own sensors and generate many logs during a process. Enterprises producing IoT devices convert these log data into more useful data through secondary processing; thus, they require data from the device users. Recently, a platform for data sharing has been developed because the demand for IoT data increases. Several IoT data marketplaces are based on peer-to-peer (P2P) networks, and in this type of marketplace, it is difficult for an enterprise to trust a data owner or the data they want to trade...
October 22, 2018: Sensors
Ana Rovisco, Rita Branquinho, Jorge Martins, Maria João Oliveira, Daniela Nunes, Elvira Fortunato, Rodrigo Martins, Pedro Barquinha
Semiconductor nanowires are mostly processed by complex, expensive, and high temperature methods. In this work, with the intent of developing zinc tin oxide nanowires (ZTO NWs) by low-cost and low-complexity processes, we show a detailed study on the influence of chemical parameters in the hydrothermal synthesis of ZTO nanostructures at temperatures of only 200 °C. Two different zinc precursors, the ratio between zinc and tin precursors, and the concentration of the surfactant agent and of the mineralizer were studied...
August 24, 2018: ACS applied nano materials
Murilo Santhiago, Priscila G da Costa, Mariane P Pereira, Cátia C Corrêa, Vitória B de Morais, Carlos C B Bufon
The synergic combination of materials and interfaces to create novel functional devices is a crucial approach for various applications, including low-cost paper-based point-of-care systems. In this work, we demonstrate the implementation of surface-modified polypyrrole (PPy) structures, monolithically integrated into a three-dimensional multilayered paper-based microfluidic device, to locally assess humidity changes. The fabrication and integration of the system include the deterministic incorporation of PPy into the paper-based structure by gas-phase polymerization and the modification of the polymer properties to allow local humidity monitoring...
October 8, 2018: ACS Applied Materials & Interfaces
Kyung Yong Ko, Sangyoon Lee, Kyunam Park, Youngjun Kim, Whang Je Woo, Donghyun Kim, Jeong-Gyu Song, Jusang Park, Jung Hwa Kim, Zonghoon Lee, Hyungjun Kim
Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) have attracted considerable attention as promising building blocks for a new generation of gas-sensing devices because of their excellent electrical properties, superior response, flexibility, and low-power consumption. Owing to their large surface-to-volume ratio, various 2D TMDCs, such as MoS2 , MoSe2 , WS2 , and WSe2 , have exhibited excellent gas-sensing characteristics. However, exploration toward the enhancement of TMDC gas-sensing performance has not yet been intensively addressed...
October 10, 2018: ACS Applied Materials & Interfaces
Weiwei Li, Changjiu Teng, Yilin Sun, Li Cai, Jian-Long Xu, Mengxing Sun, Xian Li, Xiaokuo Yang, Lan Xiang, Dan Xie, Tianling Ren
Flexible chemical sensors usually require transfer of prepared layers or whole device onto special flexible substrates and further attachment to target objects, limiting the practical applications. Herein, a sprayed gas sensor array utilizing silver nanoparticles (AgNPs)-all-carbon hybrid nanostructures is introduced to enable direct device preparation on various target objects. The fully flexible device is formed using metallic single-walled carbon nanotubes as conductive electrodes and AgNPs-decorated reduced graphene oxide as sensing layers...
October 10, 2018: ACS Applied Materials & Interfaces
Ming Chen, Zhenkai Li, Weimin Li, Chengwei Shan, Wenjie Li, Kaiwei Li, Guoqiang Gu, Ye Feng, Guohua Zhong, Lei Wei, Chunlei Yang
Advances in two-dimensional semiconducting thin films enable the realization of wearable electronic devices in the form factor of flexible substrate/thin films that can be seamlessly adapted in our daily lives. For wearable gas sensing, two-dimensional materials, such as SnSe2 , are particularly favorable because of their high surface-to-volume ratio and strong adsorption of gas molecules. Chemical vapor deposition and liquid/mechanical exfoliation are the widely applied techniques to obtain SnSe2 thin films...
November 9, 2018: Nanotechnology
Debasis Maity, Ramasamy Thangavelu Rajendra Kumar
Polyaniline (PANI) functionalized multiwall carbon nanotubes (MWCNTs) were prepared via in situ chemical polymerization process of aniline, in which MWCNTs were spray coated on the fabric for wearable ammonia sensor. Structural, morphological, thermal properties and wettability were analyzed by scanning electron microscope, X-ray diffraction, Raman analysis and contact angle measurement. No substantial change in base resistance of MWCNTs/PANI fabric sensor was observed for a wide range of bending (from 90° to 270°) shows excellent wearability...
September 28, 2018: ACS Sensors
Florin C Loghin, Aniello Falco, Andreas Albrecht, José F Salmerón, Markus Becherer, Paolo Lugli, Almudena Rivandeneyra
In this study, we report on an automated method based on a handwritten technique for the fabrication of low-cost gas sensors based on carbon nanotube (CNT) networks. Taking advantage of the inherent low-cost, flexible, and uncomplicated characteristics of pen-based techniques and combining them with an automated robotic system allows for high-resolution patterns, high reproducibility, and relatively high throughput considering the limitations of parallel processing. To showcase this, gas sensors capable of sensing NH3 , CO2 , CO, and ethanol, as well as temperature and relative humidity, are fabricated and characterized displaying competitive performance in relation to previously reported devices...
October 10, 2018: ACS Applied Materials & Interfaces
Do-Kyun Kwon, Yoann Porte, Kyung Yong Ko, Hyungjun Kim, Jae-Min Myoung
Flexible zinc oxide (ZnO) nanorod (NR) ultraviolet (UV)/gas dual sensors using silver (Ag) nanoparticle (NP) templates were successfully fabricated on a polyimide substrate with nickel electrodes. Arrays of Ag NPs were used as a template for the growth of ZnO NRs, which could enhance the flexibility and the sensing properties of the devices through the localized surface plasmon resonance (LSPR) effect. The Ag NPs were fabricated by the rapid thermal annealing process of Ag thin films, and ZnO NRs were grown on Ag NPs to maximize the surface area and form networks with rod-to-rod contacts...
September 19, 2018: ACS Applied Materials & Interfaces
Ye Tian, Jianchun Wang, Liqiu Wang
We present a gas-in-water microfluidic method to precisely fabricate well-controlled versatile microfibers with cavity knots (named cavity-microfiber), like tiny-cavity-microfiber, hybrid-cavity-microfiber, cavity-microfiber, and chained microfiber. The cavity-microfibers are endowed with tunable morphologies, unique surface properties, high specific surface area, assembling ability, flexibility, cytocompatibility, and hydroscopicity. We assemble cavity-microfibers as 3D scaffolds for culturing the human umbilical vein endothelial cells (HUVECs) and dehumidifying...
September 5, 2018: ACS Applied Materials & Interfaces
Jeongsu Kim, Haneul Yoo, Viet Anh Pham Ba, Narae Shin, Seunghun Hong
We report a colorimetric dye-functionalized sol-gel matrix on carbon nanotubes for use as a refreshable and flexible gas sensor with humidity calibration. Here, we fabricated gas sensors by functionalizing dye molecules on the top of carbon nanotube networks via a sol-gel method. Using hybrid gas sensors with different dye molecules, we could selectively detect various hazardous gases, such as NH3 , Cl2 and SO2 gases, via optical and electrical signals. The sensors exhibited rather large conductance changes of more than 50% following exposure to gas species with concentrations even under the permissible exposure limit...
August 10, 2018: Scientific Reports
Hua-Yao Li, Chul-Soon Lee, Do Hong Kim, Jong-Heun Lee
Ammonia (NH3 ) is an irritant gas with a unique pungent odor; sub-parts per million-level breath ammonia is a medical biomarker for kidney disorders and Helicobacter pylori bacteria-induced stomach infections. The humidity varies in both ambient environment and exhaled breath, and thus humidity dependence of gas-sensing characteristics is a great obstacle for real-time applications. Herein, flexible, humidity-independent, and room-temperature ammonia sensors are fabricated by the thermal evaporation of CuBr on a polyimide substrate and subsequent coating of a nanoscale moisture-blocking CeO2 overlayer by electron-beam evaporation...
August 22, 2018: ACS Applied Materials & Interfaces
Xin Zhang, Qi Zhang, Dan Yue, Jun Zhang, Jintong Wang, Bin Li, Yu Yang, Yuanjing Cui, Guodong Qian
Metal-organic framework (MOF)-polymer mixed-matrix membranes (MMMs) have shown great potential and superior performance in gas separations. However, their sensing application has not been fully established yet. Herein, a rare example of using flexible MOF-based MMMs as a fluorescent turn-on sensor for the detection of hydrogen sulfide (H2 S) is reported. These MOF-based MMMs are readily prepared by mixing a highly stable aluminum-based nano-MOF (Al-MIL-53-NO2 ) into poly(vinylidene fluoride) with high loadings up to 70%...
September 2018: Small
Shoyebmohamad F Shaikh, Balaji G Ghule, Umesh T Nakate, Pritamkumar V Shinde, Satish U Ekar, Colm O'Dwyer, Kwang Ho Kim, Rajaram S Mane
A low-temperature (90 °C) and directly grown anatase titanium dioxide (TiO2 ) nanocrystalline film using successive ionic layer adsorption and reaction (SILAR) for perovskite solar cell and gas sensor applications. TiO2 nanocrystalline electron transfer layer (ETL) improves the power conversion efficiency (PCE) of perovskite solar cells due to faster charge transport kinetics as well as slower charge recombination process. The optimized TiO2 nanocrystalline ETL (15 L) demonstrates as high as ~10% PCE with a short circuit current density of 18...
July 20, 2018: Scientific Reports
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