In this paper, the relative humidity sensor properties of graphene oxide (GO) and oxide/multiwalled nanotubes (GO/MWNTs) composites have been investigated. Composite sensors were fabricated by direct laser scribing characterized using UV-vis-NIR, Raman, Fourier transform infrared, X-ray photoemission spectroscopies, electron scanning microscopy coupled with energy-dispersive analysis, impedance spectroscopy (IS). These methods confirm composite homogeneity reduction GO/MWNT dominant GO...

Abstract Methanol, a toxic volatile compound, poses significant threats to human health and the environment. Traditional methanol sensors require high operating temperatures, exhibit poor selectivity, have limited long-term stability, which restricts their application in portable monitoring devices. This study proposes flexible chemoresistive gas sensor based on laser-induced graphene (LIG) electrodes cobalt phthalocyanine (CoPc)- multi-walled carbon nanotubes (MWCNT) composite. Experimental...

Different environmental parameters, such as temperature and humidity, aggravate food spoilage, different volatile organic compounds (VOCs) are released based on the extent of spoilage. In addition, a lack efficient monitoring dosage pesticides leads to crop failure. This could lead loss resources production with harmful contaminants short lifetime. For this reason, precise parameters contaminations during processing storage is key factor for maintaining its safety nutritional value. Thus,...

We investigated functionalized graphene materials to create highly sensitive sensors for volatile organic compounds (VOCs) such as formaldehyde, methanol, ethanol, acetone, and isopropanol. First, we prepared VOC-sensitive films consisting of mechanically exfoliated (eG) chemical oxide (GO), which have different concentrations structural defects. deposited the on silver interdigitated electrodes Kapton substrate submitted them thermal treatment. Next, measured properties resulting towards...

Terahertz Time-Domain Spectroscopy (THz-TDS) has been a powerful tool for material characterization. The Fabry-Perot (FP) effect caused by the multiple reflections within sample exists inherently, which makes echoes contaminated. In case of thin samples, different reflection signals may merge together and even corresponding to main disappears, making characterization improper or impossible. To deal with this problem, novel time-domain optimization method is proposed removing FP effect. By...

Biocharcoal (BioC), a cost-effective, eco-friendly, and sustainable material can be derived from various organic sources including agricultural waste. However, to date, complex chemical treatments using harsh solvents or physical processes at elevated temperatures have been used activate enhance the functional groups of biochar. In this paper, we propose novel easy cost-effective activation method based on electrochemical cycling in buffer solutions performance biocharcoal almond shells...

Impedance measurement ICs are widely used in embedded systems for single-sensor measurements. Thereby, the impedance value of target sensor is calculated by comparing its signal with one a given reference element. This known as calibration process. To automate process multisensor measurements, multiplexers (MUXs) recommended. But switch on-resistances MUXs cause additional deviations, unless expensive very low or buffer functions used. overcome need specially designed MUXs, circuit structure...

A stable supply of metallic elements such as potassium, calcium, and magnesium is indispensable for plant growth. Therefore, qualitative quantitative detection ions in aquaponic environments has been interest. Impedimetric sensors are attractive ease preparation, low cost, high sensitivity. In this paper, we present an impedimetric interdigitated electrode array the determination K(I), Ca(II), Mg(II) based on functionalized PEDOT:PSS. We optimize parameters sensor fabrication, demonstrate...

The photothermal interaction of a CO2 laser beam polyimide sheets results in the formation graphenous surfaces termed as laser-induced graphene (LIG). Although research and applications LIG are manifold, there have been certain aspects that require investigation, such applicability conductive fibers, which formed at combinations parameters (power, scan rate, resolution). In this work, we aim to investigate properties fibers its suitability for electrochemical applications. Fourier transform...

Rapid detection of the VOCs such as ethanol has obvious commercial value. Microelectromechanical systems (MEMS) devices based on sensitive nanomaterials are promising for this application. In contribution, a MEMS sensor chitosan - tetrasulfonated copper phthalocyanine (Chit-TsCuPc) composite was employed vapors. The device fabricated PiezoMUMPs technology. Chit-TsCuPc prepared and drop-casted interdigitated area sensor. A lab-based concentration control system applied to provide an vapor...

Electronic tongues and artificial gustation for crucial analytes in the environment, such as metal ions, are becoming increasingly important. In this contribution, we propose a multi-level fusion framework hybrid impedimetric voltammetric electronic tongue to enhance accuracy of K+, Mg2+, Ca2+ detection an extensive concentration range (100.0 nM–1.0 mM). The proposed extracts electrochemical-based features separately fuses, first step, features, which characteristic points fixed frequency...

Precise monitoring of different environmental parameters and contaminations during food processing storage is a key factor for maintaining its safety nutritional value. Thus, developing reliable, efficient, cost-effective sensor devices these purposes utmost importance. In this paper, we show that Poly-(diallyl-dimethylammonium chloride)/reduced Graphene oxide (PDAC/rGO) films produced by simple Layer-by-Layer deposition can be effectively used to monitor temperature, relative humidity the...

Abstract In the large-capacity FBG sensor network demodulation system, process of collecting light source is often accompanied by noise interference. Signal denoising an important factor that affects accurate system. Aiming at problem constant deviation soft and hard threshold functions in traditional wavelet algorithm shortcomings modal aliasing easily empirical mode decomposition, a modified semi-soft threshold-VMD proposed. The simulation results show function this paper better than...

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As essential elements for plant and animal growth, the precise qualitative quantitative recognition of K <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> , Ca xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> Mg becomes important smart agriculture fields such as aquaponic, soil less cultivation to name a few.. Sensor array applying artificial gustatory, i.e., electronic tongue, plays an role in this field is often employed analyze...

With the emerging power system files, new energy development and widespread application of technologies, materials, equipment, distribution network design are facing profound change.Paper around situation Xia mode, to achieved distributed power, electric, diversified load access for target, main from can Institute, early set, construction figure stage variable line, civil professional, on both at home abroad existing standard Combs, in-depth analysis in professional aspects exists problem,...