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In this work, a fundamental new approach for humidity detection was proposed. By coupling triboelectric nanogenerator (TENG) with resistive humidity sensor, the degree of ambient moisture can be actively detected at room temperature, where the voltage drop across the interdigital electrodes (IDEs) has a reversely proportional relationship with relative humidity. The prepared self-powered triboelectric...
This work investigates the changes in response to ozone and humidity of Atomic Layer Deposited (ALD) tin dioxide (SnO2) sensors operated at room temperature and integrated into a portable platform over several weeks. The impact of humidity is highlighted as it relates to immediate changes in ozone response and in slower changes where the history of exposure influences the surface kinetics while the...
In this work we report synthesis and characterization of integrated SWCNT-Pt-P2O5-based sensors for absolute humidity (AH) measurement. The sensors were obtained by direct deposition of an active doped layer to the surface of an interdigitated planar sensor type, by drop cast method. For the experimental investigation two sensors with the same active layer were fabricated and tested for detecting...
The structure of the universal micromodule, which is the base for a variety of electrical circuits of the integrating scanning frequency converter (ISFC), is offered. The universal micromodule performed of frameless operational amplifiers and other individually attached components can create a number of secondary resistive sensors with an output frequency signal. This is provided by a certain set...
Due to the climate change and the modern living quality requirements, the demands on environmental monitoring devices, such as temperature and humidity sensors, increase fiercely in the recent decades. To meet the needs on those sensing devices, academic and industrial studies have utilized various materials to fabricate effective sensors to detect chemical materials under stringent requirements....
A humidity sensor, which is part of an air quality sensor system, based on MWCNTs/MMA composite doped with KOH has been studied. A standard SOI CMOS process, with only one post-processing step for the membrane etching, was used to fabricate the sensor presented. In order to have a homogeneous distribution of the CNTs in the solution, the tip sonication method was employed. The current voltage and...
A MEMS-based humidity sensor is proposed comprising thiol-coated gold nanoparticles (AuNPs) deposited on a glass substrate with aluminum interdigitated electrodes (IDEs). In the proposed device, the humidity is measured by monitoring the change in the device resistance as the water molecules are absorbed by the AuNPs. A highly sensitive sensing performance is obtained as a result of the large surface...
A new methodology is developed for drying the grains by using difference in air humidity at inlet and outlet section of the drying chamber. Programmable Logic Controller (PLC) is used to control the entire drying procedure automatically. The use of grain dryers will reduce the environmental dependence for the drying process and its automation will make drying more efficient and uniform, thus saving...
For the simulation of a smart gas sensor a tale parametric representation of a polyleptic chemoresistor is projected. The simulation of equally the stagnant and active reaction of a chemoresistor to a combination of unlike gases have been implemented using Cadence software. The effects of surrounding heat (temperature), dampness and sound of sensor is also taken into account. If the values of the...
The responses of chemoresistive gas sensors suffer from the fluctuations in the background atmospheric conditions. An appropriate countermeasure is required to identify and compensate these drift-like terms introduced in the responses. Here, chemoresistive gas sensor is considered as a non-linear system. This system is characterized and verified by too many experiments. Relative humidity and temperature...
In the present study, fast response resistive-type PI/multiwall carbon nanotube (MWNT) composite films were demonstrated. A composite film with a loading of 3 wt% MWNTs (PIC30) possesses a very linear response nature, a linearity correlation (R2) of 0.99157 and a sensitivity of 0.00146/%RH. The response time were less than five seconds and the resistance changed synchronously with different humidities...
An electronic nose with a sensor array of 32 conductometric sensors has been developed at the Jet Propulsion Laboratory (JPL) to monitor breathing air in spacecraft habitat. The Third Generation ENose is designed to operate in the environment of the U.S. Lab on the International Space Station (ISS). It detects a selected group of analytes at target concentrations in the ppm regime at an environmental...
This investigation presents a novel flexible measurement device for use in proton exchange membrane fuel cells (PEMFCs). This device can measure temperature and the humidity distribution with in a PEMFC. This device has three pieces, each with several sensors, installed in the upstream, midstream and downstream parts of a PEMFC. These sensors are inserted separately above the flow channels. When the...
This document describes the process of analysis, modeling and compensation through data fusion algorithms of two hydrogen sensors for automotive applications: one is used to detect small leaks (e.g. in pipes ranging from the tank to the engine compartment), while the other has the task of detecting hydrogen concentrations near the explosivity level. Fast and accurate models of the sensors are developed...
Paper reports morphological and humidity sensing application of Cu2O doped ZnO composite prepared by solid state reaction. Pellet samples of ZnO-Cu2O nanocrystalline powders with 5, 10, 15 and 20 weight % of Cu2O in ZnO have been prepared. These pellets have been annealed at temperatures 200-500??C. When samples have been exposed to humidity, it has been observed that as relative humidity increases,...
Sensing devices using electronic-grade carbon nanotubes (EG-CNTs) as resistive sensing element were fabricated by dielectrophoresis (DEP) manipulation. DEP-based fabrication of EG-CNTs is important as it allows some control of the nominal resistance of the fabricated sensors, which is essential to improve the SNR of CNT sensors. The devices were characterized and the potential of EG-CNTs to serve...
Insulation resistance is defined as the ratio of the direct voltage applied to two electrodes in contact with or embedded in a specimen to the total current between the electrodes. Test values, therefore, are highly dependent on the geometry of the electrode-specimen system and the volume and surface resistances of the material under test. Also, the numerical results obtained are extremely sensitive...
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