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https://read.qxmd.com/read/30781388/high-sensitivity-flexible-electronic-skin-based-on-graphene-film
#1
Xiaozhou Lü, Jiayi Yang, Liang Qi, Weimin Bao, Liang Zhao, Renjie Chen
Electronic skin with high sensitivity, rapid response, and long-term stability has great value in robotics, biomedicine, and in other fields. However, electronic skin still has challenges in terms of sensitivity and response time. In order to solve this problem, flexible electronic skin with high sensitivity and the fast response was proposed, based on piezoresistive graphene films. The electronic skin was a pressure sensor array, composed of a 4 × 4 tactile sensing unit. Each sensing unit contained three layers: The underlying substrate (polyimide substrate), the middle layer (graphene/polyethylene terephthalate film), and the upper substrate bump (polydimethylsiloxane)...
February 15, 2019: Sensors
https://read.qxmd.com/read/30776034/an-ultranarrow-spr-linewidth-in-the-uv-region-for-plasmonic-sensing
#2
Jie Zheng, Weimin Yang, Jingyu Wang, Jinfeng Zhu, Lihua Qian, Zhilin Yang
Conventional surface plasmon resonance (SPR) modes based on gold and silver nanostructures only operate in the visible and near-infrared (NIR) regions. Nowadays, with the rapid development of strong coupling between molecules and plasmonic nanostructures and surface enhanced spectroscopy, it is highly desired to modulate the SPR modes with a narrow linewidth toward the ultraviolet (UV) wavelength region through a low cost and reproducible fabrication method. Herein, laser interference lithography is utilized to manufacture stable Al plasmonic arrays with well-controlled and tunable geometries...
February 18, 2019: Nanoscale
https://read.qxmd.com/read/30776029/route-towards-sustainable-smart-sensors-ferroelectric-polyvinylidene-fluoride-based-materials-and-their-integration-in-flexible-electronics
#3
REVIEW
Barbara Stadlober, Martin Zirkl, Mihai Irimia-Vladu
With the advent of the Internet of Everything (IoE) era, our civilization and future generations will employ an unimaginable complex array of electronics and sensors in daily life. Ferroelectric polymers represent a core group of materials supporting the fast development of IoE, and their functionality, straightforward processing and unmatched versatility make them prime candidates for integration in multifaceted devices. Since they are highly selective, highly responsive, highly scalable, self-powering and compatible with flexible and stretchable substrates, they can be easily integrated with various electronics into numerous stand-alone objects and even into skin as sensors for monitoring diverse mechanical, thermal and vital parameters...
February 18, 2019: Chemical Society Reviews
https://read.qxmd.com/read/30771987/novel-color-standards-for-digital-color-analysis-of-optochemical-sensor-arrays
#4
Andrey V Kalinichev, Nadezhda V Pokhvishcheva, Maria A Peshkova
The indicator-based polymeric color standards for color referencing in digital color analysis (DCA) of optical chemical sensors (optodes) are proposed. In the novel standards, the colors referring to the actual absorption bands of the protonated and deprotonated forms of the indicator are mixed in constant proportions. The standards are based on the lipophilic pH-indicators: ETH5350 and ETH2439, commonly used in optodes, and the lipophilic electrolyte TBATBB. The dependence of the standard color on the TBATBB concentration in the optode is established and found to be linear...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771936/a-signal-on-photoelectrochemical-aptasensor-based-on-graphene-quantum-dots-sensitized-tio-2-nanotube-arrays-for-sensitive-detection-of-chloramphenicol
#5
Xiaofei Qin, Qianqian Wang, Liping Geng, Xiaoli Shu, Yan Wang
An ultrasensitive photoelectrochemical (PEC) aptasensor was designed for detection of chloramphenicol (CAP) based on graphene quantum dots-sensitized TiO2 nanotube arrays (GQDs/TiO2 NTs). The GQDs/TiO2 NTs nanohybrids were prepared by a coupling technique of linker molecule binding and electrophoretic deposition. It exhibited significantly enhanced visible-light photoelectrochemical activity, which was firstly employed as the photoactive material for fabrication of PEC aptasensor. As the recognition unit, the aptamers of CAP were immobilized on GQDs/TiO2 NTs photoelectrode via π-π stacking interaction between GQDs and the nucleobases of the aptamer...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771915/a-differential-photoelectrochemical-hydrogen-peroxide-sensor-based-on-catalytic-activity-difference-between-two-zeolitic-imidazolate-framework-surface-coatings
#6
Jianzhi Dou, Dejie Li, Huijuan Li, Qi Kang, Jianjun Lu, Dazhong Shen
Improvement of the sensitivity and selectivity is important in the development of an analytical method. Herein, we propose a differential photoelectrochemical (PEC) sensor to hydrogen peroxide based on the catalytic activity difference between two zeolitic imidazolate framework (ZIF) surface coatings. In the sensing and reference photoelectrodes, ZIF-67 and ZIF-8 films were grown on the surface of carboxylated carbon nanotubes-graphite-like carbon nitride/TiO2 nanotube array, respectively. The molecular sieve effect of ZIF-8 and ZIF-67 coatings can prevent the diffusion of molecules with size larger than the pores in coating layers (e...
May 15, 2019: Talanta
https://read.qxmd.com/read/30769956/compact-acoustic-rainbow-trapping-in-a-bioinspired-spiral-array-of-graded-locally-resonant-metamaterials
#7
Liuxian Zhao, Shengxi Zhou
Acoustic rainbow trappers, based on frequency selective structures with graded geometries and/or properties, can filter mechanical waves spectrally and spatially to reduce noise and interference in receivers. These structures are especially useful as passive, always-on sensors in applications such as structural health monitoring. For devices that face space and weight constraints, such as microelectromechanical systems (MEMS) transducers and artificial cochleae, the rainbow trapping structures must be compact as well...
February 15, 2019: Sensors
https://read.qxmd.com/read/30768896/all-mos-2-based-large-area-skin-attachable-active-matrix-tactile-sensor
#8
Yong Ju Park, Bhupendra K Sharma, Sachin M Shinde, Min-Seok Kim, Bongkyun Jang, Jae-Hyun Kim, Jong-Hyun Ahn
Large-area, ultra-thin flexible tactile sensors with conformal adherence are becoming crucial for advances in wearable electronics, electronic skins and bio-robotics. However, normal passive tactile sensors suffer from high crosstalk, resulting in inaccurate sensing, which consequently, limits their use in such advanced applications. Active-matrix driven tactile sensors could potentially overcome such hurdles but it demands the high performance and reliable operations of the thin-film-transistor array that could efficiently control integrated pressure gauges...
February 15, 2019: ACS Nano
https://read.qxmd.com/read/30767497/flexible-electronics-toward-wearable-sensing
#9
Wei Gao, Hiroki Ota, Daisuke Kiriya, Kuniharu Takei, Ali Javey
Wearable sensors play a crucial role in realizing personalized medicine, as they can continuously collect data from the human body to capture meaningful health status changes in time for preventive intervention. However, motion artifacts and mechanical mismatches between conventional rigid electronic materials and soft skin often lead to substantial sensor errors during epidermal measurement. Because of its unique properties such as high flexibility and conformability, flexible electronics enables a natural interaction between electronics and the human body...
February 15, 2019: Accounts of Chemical Research
https://read.qxmd.com/read/30764485/gold-nanodisks-plasmonic-array-for-hydrogen-sensing-at-low-temperature
#10
Marco Sturaro, Gabriele Zacco, Pierfrancesco Zilio, Alessandro Surpi, Marco Bazzan, Alessandro Martucci
We present a novel plasmonic hydrogen sensor consisting of an array of gold nanodisks produced by lithography. The size, height, and spacing of the disks were optimized using finite element simulation to generate a sharp localized surface plasmon resonance peak in the near-infrared wavelength region. The reported results show the possibility of developing an optical gas sensors-based bare Au nanostructures operating at a low temperature.
February 5, 2019: Sensors
https://read.qxmd.com/read/30763380/improved-scheduling-algorithm-for-signal-processing-in-asynchronous-distributed-ultrasonic-total-focusing-method-system
#11
Yuzhong Li, Wenming Tang, Guixiong Liu
Compared to the conventional ultrasonic phased-array system, a large-element phased-array system employing the total focusing method (TFM) can yield improved image resolution and accuracy, providing more flexible scanning methods and image merging functionality. In order to meet various forms of ultrasonic multi-group scanning, an architecture for multi-group scan integration called the "asynchronous distributed ultrasonic TFM system" is proposed, and a novel scheduling algorithm called "the sum of start time and processing time adjacent (SSPA) algorithm" is presented...
2019: PloS One
https://read.qxmd.com/read/30759983/gas-adsorption-at-metal-sites-for-enhancing-gas-sensing-performance-of-zno-zif-71-nanorod-arrays
#12
Tingting Zhou, Yutong Sang, Yanling Sun, Congyi Wu, Xiaoxia Wang, Xing Tang, Tian Zhang, Hao Wang, Changsheng Xie, Dawen Zeng
The detection of trace amount of volatile organic compounds (VOCs) has been covered by tons of researches, which are dedicated to improve the detection limit and insensitivity to humidity. In this work, we have synthesized ZnO@ZIF-71 nanorod arrays (NRAs) equipped with the adsorption effect at metal site that promoted the detection limit of ethanol and acetone, to which also have great selectivity. The gas sensor not only exhibits shorter response/recovery time (53/55% for ethanol, 48/31% for acetone), but also excellent insensitivity to humidity and improved detection limit (10 times improved at 21 ppb for ethanol, 4 times at 3 ppb for acetone) at low working temperature (150 °C)...
February 13, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30759869/analysis-and-evaluation-of-the-image-preprocessing-process-of-a-six-band-multispectral-camera-mounted-on-an-unmanned-aerial-vehicle-for-winter-wheat-monitoring
#13
Jiale Jiang, Hengbiao Zheng, Xusheng Ji, Tao Cheng, Yongchao Tian, Yan Zhu, Weixing Cao, Reza Ehsani, Xia Yao
Unmanned aerial vehicle (UAV)-based multispectral sensors have great potential in crop monitoring due to their high flexibility, high spatial resolution, and ease of operation. Image preprocessing, however, is a prerequisite to make full use of the acquired high-quality data in practical applications. Most crop monitoring studies have focused on specific procedures or applications, and there has been little attempt to examine the accuracy of the data preprocessing steps. This study focuses on the preprocessing process of a six-band multispectral camera (Mini-MCA6) mounted on UAVs...
February 12, 2019: Sensors
https://read.qxmd.com/read/30759743/measuring-ocular-aberrations-sequentially-using-a-digital-micromirror-device
#14
Alessandra Carmichael Martins, Brian Vohnsen
The Hartmann⁻Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets. In this study, we explore ocular aberration measurements with a recently-proposed variant of the sensor that makes use of a digital micromirror device for sequential aperture scanning of the pupil, thereby avoiding the use of a lenslet array. We report on results with the sensor using two different detectors, a lateral position sensor and a charge-coupled device (CCD) scientific camera, and explore the pros and cons of both...
February 12, 2019: Micromachines
https://read.qxmd.com/read/30758876/developing-a-new-device-for-continuously-recording-in-vivo-the-excretion-rate-of-sweat-perspiration-in-humans
#15
Elisa Caberlotto, Carole Guillou, Loic Colomb, Charlie Barla, Samir Salah, Marco Vicic, Frederic Revol-Cavalier, Venceslass Rat, Sabine Filipe, Frederic Flament
BACKGROUND: Some methodologies used for evaluating sweat production and antiperspirants are of a stationary aspect, that is, most often performed under warm (38°C) but resting conditions in a rather short period of time. The aim is to develop an electronic sensor apt at continuously recording sweat excretion, in vivo, during physical exercises, exposure to differently heated environments, or any other stimuli that may provoke sweat excretion. MATERIAL AND METHODS: A sensor (20 cm2 ) is wrapped under a double-layered textile pad...
February 13, 2019: Skin Research and Technology
https://read.qxmd.com/read/30744773/nanostructured-based-electrochemical-sensors
#16
Bernardo Patella, Carmelo Sunseri, Rosalinda Inguanta
In this work, we present some results concerning the electrochemical behavior of nanostructured-based electrochemical sensors. In particular, the attention has been focused on Pd and Cu nanowires for detection of hydrogen peroxide and NiO thin film or Ni@NiO core-shell nanowires for detection of mercury ions. Ordered array of Pd and Cu nanowires was obtained through displacement deposition reaction in a commercial polycarbonate membrane acting as a template. The method leads to stable nanostructured electrodes of Pd and Cu with high surface area...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744093/direction-of-arrival-estimation-in-coprime-array-using-the-esprit-based-method
#17
Zhen Meng, Weidong Zhou
Coprime arrays have shown potential advantages for direction-of-arrival (DOA) estimation by increasing the number of degrees-of-freedom in the difference coarray domain with fewer physical sensors. In this paper, a new DOA estimation algorithm for coprime array based on the estimation of signal parameter via rotational invariance techniques (ESPRIT) is proposed. We firstly derive the observation vector of the virtual uniform linear array but the covariance matrix of this observation vector is rank-deficient...
February 9, 2019: Sensors
https://read.qxmd.com/read/30740148/review-new-insights-into-optimizing-chemical-and-3d-surface-structures-of-carbon-electrodes-for-neurotransmitter-detection
#18
Qun Cao, Pumidech Puthongkham, B Jill Venton
The carbon-fiber microelectrode has been used for decades as a neurotransmitter sensor. Recently, new strategies have been developed for making carbon electrodes, including using carbon nanomaterials or pyrolyzing photoresist etched by nanolithography or 3D printing. This review summarizes how chemical and 3D surface structures of new carbon electrodes are optimized for neurotransmitter detection. There are effects of the chemical structure that are advantageous and nanomaterials are used ranging from carbon nanotube (CNT) to graphene to nanodiamond...
January 21, 2019: Analytical Methods: Advancing Methods and Applications
https://read.qxmd.com/read/30738247/nanohole-array-plasmonic-biosensors-emerging-point-of-care-applications
#19
REVIEW
Alisha Prasad, Junseo Choi, Zheng Jia, Sunggook Park, Manas Ranjan Gartia
Point-of-care (POC) applications have expanded hugely in recent years and is likely to continue, with an aim to deliver cheap, portable, and reliable devices to meet the demands of healthcare industry. POC devices are designed, prototyped, and assembled using numerous strategies but the key essential features that biosensing devices require are: (1) sensitivity, (2) selectivity, (3) specificity, (4) repeatability, and (5) good limit of detection. Overall the fabrication and commercialization of the nanohole array (NHA) setup to the outside world still remains a challenge...
January 24, 2019: Biosensors & Bioelectronics
https://read.qxmd.com/read/30737909/a-multimaterial-microphysiological-platform-enabled-by-rapid-casting-of-elastic-microwires
#20
Yimu Zhao, Erika Yan Wang, Locke Huyer Davenport, Yin Liao, Keith Yeager, Gordana Vunjak-Novakovic, Milica Radisic, Boyang Zhang
Due to escalating drug developmental costs and limitations of cardiotoxicity screening, there is an urgent need to develop robust in vitro 3D tissue culture platforms that can both facilitate the culture of human cardiac tissues and provide noninvasive functional readouts predictive of cardiotoxicity in clinical settings. However, such platforms commonly require complex fabrication procedures that are difficult to scale up to high-throughput testing platforms. Here, innovative multimaterial processing into a scalable and functional platform is proposed in the format of a 96-well plate...
February 9, 2019: Advanced Healthcare Materials
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