Read by QxMD icon Read

Gas sensors

Musabbir Khan, Chris G Pretty, Alexander C Amies, Joel Balmer, Houda E Banna, Geoffrey M Shaw, J Geoffrey Chase
BACKGROUND: Pulse oximeters continuously monitor arterial oxygen saturation. Continuous monitoring of venous oxygen saturation (SvO2) would enable real-time assessment of tissue oxygen extraction (O2E) and perfusion changes leading to improved diagnosis of clinical conditions, such as sepsis. METHODS: This study presents the proof of concept of a novel pulse oximeter method that utilises the compliance difference between arteries and veins to induce artificial respiration-like modulations to the peripheral vasculature...
May 19, 2017: Biomedical Engineering Online
Oren Gall, Xiahua Zhong, Daniel Schulman, Myungkoo Kang, Ali Razavieh, Theresa Mayer
Nanosensor arrays have recently received significant attention due to their utility in a wide range of applications, including gas sensing, fuel cells, internet of things (IoT), and portable health monitoring systems. Less attention has been given to the production of sensor platforms in the µW range for ultra-low power applications. Here, we discuss how to scale the nanosensor energy demand by developing a process for integration of nanowire sensing arrays on a monolithic CMOS chip. This work demonstrates an off-chip nanowire fabrication method; subsequently nanowires link to a fused SiO2 substrate using electric-field assisted directed assembly...
May 19, 2017: Nanotechnology
Xinyuan Chong, Ki-Joong Kim, Yujing Zhang, Erwen Li, Paul Ohodnicki, Chih-Hung Chang, Alan Wang
In this letter, we present a nanophotonic device consisting of plasmonic nano-patch array with integrated metal-organic framework (MOF) for enhanced infrared absorption gas sensing. By designing a gold nanopatch array (Au-NPA) on a sapphire substrate, we are able to achieve enhanced optical field that spatially overlaps with the MOF layer, which can adsorb carbon dioxide (CO2) with high capacity. Experimental results show that this hybrid plasmonic-MOF device can effectively increase the infrared absorption path of on-chip gas sensors by more than 1,100-fold...
May 19, 2017: Nanotechnology
Xingsong Su, Guotao Duan, Zongke Xu, Fei Zhou, Weiping Cai
The structure and thickness of the chemiresistive thin films can significantly affect their gas sensing performances for the heating-typed sensors. Under light irradiation, however, their influences are still to be addressed. In present paper, the multilayered ZnO porous thin films with different (three types) micro/nanostructures and controllable thickness are fabricated via layer by layer construction of the self-assembled colloidal-layers. The structural and thickness effects of such films on the gas sensing performances to NO2 under ultraviolet (UV) illumination are experimentally studied...
May 10, 2017: Journal of Colloid and Interface Science
Lina Zheng, Pramod Kulkarni
A new, low-cost approach based on the application of atmospheric radio frequency glow discharge (rf-GD) optical emission spectroscopy (OES) has been developed for near real-time measurement of multielemental concentration in airborne particulate matter. This method involves deposition of aerosol particles on the tip of a grounded electrode of a coaxial microelectrode system, followed by ablation, atomization and excitation of the particulate matter using the rf-GD. The resulting atomic emissions were recorded using a spectrometer for elemental identification and quantification...
May 17, 2017: Analytical Chemistry
Yumin Zhang, Jianhong Zhao, Tengfei Du, Zhongqi Zhu, Jin Zhang, Qingju Liu
Air quality around the globe is declining and public health is seriously threatened by indoor air pollution. Typically, indoor air pollutants are composed of a series of volatile organic compounds (VOCs) that are generally harmful to the human body, especially VOCs with low molecular weights (less than 100 Da). Moreover, in some situations, more than one type of VOC is present; thus, a device that can detect one or more VOCs simultaneously would be most beneficial. Here, we synthesized a sensor array with 4 units to detect 4 VOCs: acetone (unit 1), benzene (unit 2), methanol (unit 3) and formaldehyde (unit 4) simultaneously...
May 16, 2017: Scientific Reports
Wang Li, Hongying Liu, Dandan Xie, Zichun He, Xititan Pi
In recent years, electronic nose (e-nose) systems have become a focus method for diagnosing pulmonary diseases such as lung cancer. However, principles and patterns of sensor responses in traditional e-nose systems are relatively homogeneous. Less study has been focused on type-different sensor arrays. In this paper, we designed a miniature e-nose system using 14 gas sensors of four types and its subsequent analysis of 52 breath samples. To investigate the performance of this system in identifying and distinguishing lung cancer from other respiratory diseases and healthy controls, five feature extraction algorithms and two classifiers were adopted...
May 16, 2017: Scientific Reports
Fred Feng, Shan Bao, James R Sayer, Carol Flannagan, Michael Manser, Robert Wunderlich
This paper investigated the characteristics of vehicle longitudinal jerk (change rate of acceleration with respect to time) by using vehicle sensor data from an existing naturalistic driving study. The main objective was to examine whether vehicle jerk contains useful information that could be potentially used to identify aggressive drivers. Initial investigation showed that there are unique characteristics of vehicle jerk in drivers' gas and brake pedal operations. Thus two jerk-based metrics were examined: (1) driver's frequency of using large positive jerk when pressing the gas pedal, and (2) driver's frequency of using large negative jerk when pressing the brake pedal...
May 9, 2017: Accident; Analysis and Prevention
Bilal Tawbe, Ana-Maria Cretu
The realistic representation of deformations is still an active area of research, especially for deformable objects whose behavior cannot be simply described in terms of elasticity parameters. This paper proposes a data-driven neural-network-based approach for capturing implicitly and predicting the deformations of an object subject to external forces. Visual data, in the form of 3D point clouds gathered by a Kinect sensor, is collected over an object while forces are exerted by means of the probing tip of a force-torque sensor...
May 11, 2017: Sensors
Shuang Qiao, Bin Zhang, Kaiyu Feng, Ridong Cong, Wei Yu, Guangsheng Fu, Shufang Wang
Molybdenum disulfide (MoS2), as a typical two-dimensional (2D) material, has attracted extensive attention in recent years due to its fascinating optical and electric properties. However, the applications of MoS2 have been mainly in photovoltaic devices, field-effect transistors, photodetectors, and gas sensors. Here, it is demonstrated that MoS2 can be found another important application in position sensitive detector (PSD) based on lateral photovoltaic effect (LPE) in it. The ITO/MoS2(3, 5, 7, 9, 10, 20, 50, 100 nm)/p-Si heterojunctions were successfully prepared with vertically standing nanosheet structure of MoS2...
May 11, 2017: ACS Applied Materials & Interfaces
Won-Tae Koo, Ji-Soo Jang, Seon-Jin Choi, Hee-Jin Cho, Il-Doo Kim
Metal-organic framework (MOF) derived synergistic catalysts were easily functionalized on hollow SnO2 nanotubes (NTs) via electrospinning and subsequent calcination. Nanoscale Pd NPs (~ 2 nm) loaded Zn based zeolite imidazole framework (Pd@ZIF-8, ~ 80 nm) was used as a new catalyst loading platform for effective functionalization of PdO@ZnO complex catalyst onto the thin wall of one-dimensional (1D) metal oxide NTs. The well-dispersed nanoscale PdO catalysts (3¬-4 nm) and multi-heterojunctions (PdO/ZnO and ZnO/SnO2) on hollow structures are essential for the development of high-performance gas sensors...
May 11, 2017: ACS Applied Materials & Interfaces
José Luis Muñoz-Cobo, Sergio Chiva, Santos Méndez, Guillem Monrós, Alberto Escrivá, José Luis Cuadros
This paper describes all the procedures and methods currently used at UPV (Universitat Politécnica de Valencia) and UJI (University Jaume I) for the development and use of sensors for multi-phase flow analysis in vertical pipes. This paper also describes the methods that we use to obtain the values of the two-phase flow magnitudes from the sensor signals and the validation and cross-verification methods developed to check the consistency of the results obtained for these magnitudes with the sensors. First, we provide information about the procedures used to build the multi-sensor conductivity probes and some of the tests performed with different materials to avoid sensor degradation issues...
May 10, 2017: Sensors
Rosamaria Capuano, Paola Spitalieri, Rosa Valentina Talarico, Ana Carolina Domakoski, Alexandro Catini, Roberto Paolesse, Eugenio Martinelli, Giuseppe Novelli, Federica Sangiuolo, Corrado Di Natale
Cellular metabolism of stem cell biology is still an unexplored field. However, considering the amount of information carried by metabolomes, this is a promising field for a fast identification of stem cells itself and during the differentiation process. One of the goals of such application is the identification of residual pluripotent cells before cell transplantation to avoid the occurrence of teratomas. In this paper, we investigated in vitro the volatile compounds (VOCs) released during human induced pluripotent stem cells (hiPSCs) reprogramming...
May 9, 2017: Scientific Reports
Sang-Joon Kim, Seon-Jin Choi, Ji-Soo Jang, Hee-Jin Cho, Il-Doo Kim
As a futuristic diagnosis platform, breath analysis is gaining much attention because it is a noninvasive, simple, and low cost diagnostic method. Very promising clinical applications have been demonstrated for diagnostic purposes by correlation analysis between exhaled breath components and specific diseases. In addition, diverse breath molecules, which serve as biomarkers for specific diseases, are precisely identified by statistical pattern recognition studies. To further improve the accuracy of breath analysis as a diagnostic tool, breath sampling, biomarker sensing, and data analysis should be optimized...
May 8, 2017: Accounts of Chemical Research
Tetiana A Dontsova, Svitlana V Nagirnyak, Vladyslav V Zhorov, Yuriy V Yasiievych
Zero- and 1D (one-dimensional) tin (IV) oxide nanostructures have been synthesized by thermal evaporation method, and a comparison of their morphology, crystal structure, sorption properties, specific surface area, as well as electrical characteristics has been performed. Synthesized SnO2 nanomaterials were studied by X-ray diffraction, scanning and transmission electron microscopy (SEM and TEM), N2 sorption/desorption technique, IR spectroscopy and, in addition, their current-voltage characteristics have also been measured...
December 2017: Nanoscale Research Letters
George Fedorenko, Ludmila Oleksenko, Nelly Maksymovych, Galina Skolyar, Oleksandr Ripko
Semiconductor sensors based on nanosized Pd-containing tin dioxide have been obtained by a sol-gel technique. Semiconductor gas-sensitive materials were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD) methods. Influence of Pd additives on sensitivity of the sensors to methane has been studied. Temperature dependences of electrical resistance in air and sensor response to methane on palladium content for the sensors based on nanosized materials Pd/SnO2 have been investigated...
December 2017: Nanoscale Research Letters
Shih-Yu Tseng, Szu-Ying Li, Shang-Yi Yi, Aileen Y Sun, Dong-Yu Gao, Dehui Wan
This paper describes the fabrication of paper-based plasmonic refractometric sensors through the embedding of metal nanoparticles (NPs) onto flexible papers using reversal nanoimprint lithography. The NP-embedded papers can serve as gas sensors for the detection of volatile biogenic amines (BAs) released from spoiled food. Commercial inkjet papers were employed as sensor substrates-their high reflectance (>80%) and smooth surfaces (roughness: ca. 4.9 nm) providing significant optical signals for reflection-mode plasmonic refractometric sensing and high particle transfer efficiency, respectively; in addition, because inkjet papers have lightweight and are burnable and flexible, they are especially suitable for developing portable, disposable, cost-effective, eco-friendly sensing platforms...
May 11, 2017: ACS Applied Materials & Interfaces
Yue Zhuang, Wenjing Yuan, Liu Qian, Shan Chen, Gaoquan Shi
Thin films of a thiocyanate ion (SCN(-))-doped organometal halide perovskite, CH3NH3PbI3-x(SCN)x, were used as a sensing material for developing high-performance gas sensors. The CH3NH3PbI3-x(SCN)x-based chemiresistor-type sensor can sensitively and selectively detect acetone and nitrogen dioxide (NO2) at room temperature with high sensitivities of 5.6 × 10(-3) and 5.3 × 10(-1) ppm(-1). The limits of detection for acetone and NO2 were measured to be 20 ppm and 200 ppb. This sensor also exhibited excellent repeatability, and its environmental stability was greatly improved by doping the perovskite with SCN(-) ions...
May 4, 2017: Physical Chemistry Chemical Physics: PCCP
He Zhang, Jianxin Yi, Xi Jiang
A planar mixed-potential type sensor consisting of La0.8Sr0.2Cr0.5Fe0.5O3-δ sensing electrode, yttria-stabilized zirconia solid electrolyte, and Pt reference electrode was developed for H2 detection. The sensor showed high and repeatable response with a value of -143.6 mV for 1000 ppm H2 at 450 ˚C. The sensor response varied linearly or logarithmically with the hydrogen concentration in the range of 20-100 ppm and 100-1000 ppm H2, respectively. The response/recovery time generally decreased with increasing concentration and temperature, and reached almost steady above 300 ppm H2...
May 4, 2017: ACS Applied Materials & Interfaces
Jianliang Cao, Cong Qin, Yan Wang, Bo Zhang, Yuxiao Gong, Huoli Zhang, Guang Sun, Hari Bala, Zhanying Zhang
The SnO₂/g-C₃N₄ composites were synthesized via a facile calcination method by using SnCl₄·5H₂O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), the field-emission scanning electron microscopy and transmission electron microscopy (FESEM and TEM), energy dispersive spectrometry (EDS), thermal gravity and differential thermal analysis (TG-DTA), and N₂-sorption. The analysis results indicated that the as-synthesized samples possess the two dimensional structure...
April 29, 2017: Nanomaterials
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"