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Flexible gas sensor

Michael G Stanford, Kaichun Yang, Yieu Chyan, Carter Kittrell, James M Tour
Laser-induced graphene (LIG) has received much attention since it enables simple and rapid synthesis of porous graphene. This work presents a robust direct-write LIG-based gas sensor, which senses gases based on thermal conductivity, similar to a katharometer sensor. The gas sensors are fabricated by lasing polyimide substrates with a 10.6 μm CO2 laser to synthesize LIG. This enables the formation of flexible gas sensors which could be incorporated on a variety of surfaces. High surface area and thermal conductivity of the LIG results in rapid response times for all studied gases...
March 8, 2019: ACS Nano
Chonghui Zhu, Umut Çakmak, Ommeaymen Sheikhnejad, Xiaoli Cheng, Xianfa Zhang, Yingming Xu, Shan Gao, Hui Zhao, Lihua Huo, Zoltán Major
Novel sea cucumber-shaped polyaniline/ferric oxide (PANI/Fe2O3) nanocomposites were synthesized using a simple and efficient one-step hydrothermal process, and further assembling the nanocomposites onto a polyethylene terephthalate (PET) flexible substrate. Through monitoring the resistance of the PANI/Fe2O3 nanocomposites thick film and PANI/Fe2O3-PET flexible sensors, the responses of the sensors are obtained to various 100 ppm gases including methanol, triethylamine, aniline and other five gases. It is found that two kinds of sensors exhibit a high selectivity towards NH3...
February 15, 2019: Nanotechnology
Fang Li, Huifen Peng, Dan Xia, Jinzheng Yang, Kai Yang, Fuxing Yin, Wenjing Yuan
Highly sensitive, selective and room-temperature-performed gas sensors are always the pursuit in the sensing field for practical applications. However, the existing gas sensors can seldom satisfy the aforementioned requirements. Here, we integrate zero-dimensional Ag nanoparticles (AgNP), one-dimensional polymer fibers and two-dimensional aminoanthroquinone functioned reduced graphene oxide (AQRGO) sheets into a three-dimensional sensing scaffold (AgNP-3D-AQRGO) for high performance NO2 sensing. The AQ moieties and AgNP are decorated onto the RGO sheets through a wet chemical route...
February 13, 2019: ACS Applied Materials & Interfaces
Zhijian Li, Xiaohan Yang, Wei Li, Hanbin Liu
Cellulose paper derived from plants has served as a carrier of cultural inheritance since it was invented 2000 years ago. It attracted more and more attentions in recent years working as a versatile platform to develop functional materials because of its good flexibility, sustainability, biodegradability, low cost and great capability to be modified. Once be functionalized, such as modified with stimuli-responsive polymers, small molecules or inorganic particles, papers may be sensitive to external stimuli from environments and consequently find applications in wide ranges including protein separation, controlled drug release, switchable surfaces, sensoring devices and smart substrates with various colors, etc...
April 15, 2019: Carbohydrate Polymers
Yeonhoo Kim, Yong Seok Choi, Seo Yun Park, Taehoon Kim, Seung-Pyo Hong, Tae Hyung Lee, Cheon Woo Moon, Jong-Heun Lee, Donghwa Lee, Byung Hee Hong, Ho Won Jang
Graphene is one of the most promising materials for high-performance gas sensors due to its unique properties such as high sensitivity at room temperature, transparency, and flexibility. However, the low selectivity and irreversible behavior of graphene-based gas sensors are major problems. Here, we present unprecedented room temperature hydrogen detection by Au nanoclusters supported on self-activated graphene. Compared to pristine graphene sensors, the Au-decorated graphene sensors exhibit highly improved gas-sensing properties upon exposure to various gases...
January 29, 2019: Nanoscale
Georges Dubourg, Marko Radovic
Recently, multifunctional devices printed on flexible substrates, with multisensing capability, have found new demand in the practical fields of application such as wearable electronics, soft robotics, interactive interfaces and electronic skin design, revealing the vital importance of precise control of the fundamental properties of metal oxide nanomaterials. In this paper, a novel low-cost and scalable processing strategy is proposed to fabricate all-printed multisensing devices with UV and gas sensing capabilities...
January 17, 2019: ACS Applied Materials & Interfaces
Manan Dosi, Irene Lau, Yichen Zhuang, David S A Simakov, Michael W Fowler, Michael A Pope
Methane is a potent greenhouse gas with large emissions occurring across gas distribution networks and mining/extraction infrastructure. The development of inexpensive, low-power electrochemical sensors could provide a cost-effective means to carry out distributed sensing to identify leaks for rapid mitigation. In this work, we demonstrate a simple and cost-effective strategy to rapidly prototype ultra-sensitive electrochemical gas sensors. A room temperature methane sensor is evaluated which demonstrates the highest reported sensitivity (0...
January 16, 2019: ACS Applied Materials & Interfaces
Solleti Goutham, Naradala Jayarambabu, Chinta Sandeep, Kishor Kumar Sadasivuni, Devarai Santhosh Kumar, Kalagadda Venkateswara Rao
The authors decribe an ultra-sensitive, room temperature, flexible transparent LPG sensor based on the use of a CdO/graphene nanocomposite. The graphene prevents the accumulation of CdO, enhances the surface area, and acts as a gas sensing material. FESEM images show a uniform decoration of CdO nanoparticles on graphene. The CdO/graphene composite was deposited as a film on interdigitated electrodes (IDEs) which then were used for chemiresistive sensing of liquid petroleum gas (LPG) by using a four probe technique...
January 9, 2019: Mikrochimica Acta
Carlos Alberto Socarrás Bertiz, Juan Jesús Fernández Lozano, Jose Antonio Gomez-Ruiz, Alfonso García-Cerezo
Robots, or in general, intelligent vehicles, require large amounts of data to adapt their behavior to the environment and achieve their goals. When their missions take place in large areas, using additional information to that gathered by the onboard sensors frequently offers a more efficient solution of the problem. The emergence of Cyber-Physical Systems and Cloud computing allows this approach, but integration of sensory information, and its effective availability for the robots or vehicles is challenging...
January 8, 2019: Sensors
Mariavitalia Tiddia, Ichiro Mihara, Martin P Seah, Gustavo Ferraz Trindade, Felix Kollmer, Clive J Roberts, Richard J M Hague, Guido Mula, Ian S Gilmore, Rasmus Havelund
Organic-inorganic hybrid materials enable the design and fabrication of new materials with enhanced properties. The interface between the organic and inorganic materials is often critical to the device's performance and therefore chemical characterization is of significant interest. Since the interfaces are often buried, milling by focused ion beams (FIB) to expose the interface is becoming increasingly popular. Chemical imaging can subsequently be obtained using secondary ion mass spectrometry. However, the FIB milling process damages the organic material...
January 3, 2019: ACS Applied Materials & Interfaces
Zhenzhong Yu, Yun Tang, Guoneng Cai, Rongrong Ren, Dianping Tang
A novel paper electrode-based flexible pressure sensor modified with multi-walled carbon nanotubes was designed for point-of-care (POC) immunoassay of carcinoembryonic antigen (CEA) with digital multimeter readout. The portable POC testing device consisted of flexible pressure sensor equipped with a paper electrode and connected through a syringe tubing to a single-broken microplate. The immunoreaction was initially carried out on the microplate with a sandwich-type assay for-mat using platinum nanozyme-labeled secondary antibody for the gas generation...
December 20, 2018: Analytical Chemistry
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
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