Highly Response and Sensitivity Chitosan-Polyvinyl alcohol Based Hexanal Sensors

Abstract

Abstract. This work is to study the sensing properties of chitosanpolyvinyl alcohol film sensors upon hexanal gas exposure using vapour sensing technique. The sensor fabrication process was done using electrochemical deposition method by deposit the sensing materials on the gold patterned electrode with chitosan/PVA. The response value of chitosan-PVA film sensors towards hexanal was taken as an output voltage using electrical testing method. In this study, 1.75% of chitosan with 5% of PVA were mixed with the ratio of (95:5) was tested upon exposure to hexanal gas. The concentration of the hexanal was varied as 10 ppm, 20 ppm, 30 ppm. It was found that the chitosan-PVA film sensors showed fast response, stable, good stability, good recovery, repeatable and good sensitivity towards hexanal exposure. The morphology of the pure chitosan and chitosan-PVA was analyzed by scanning electron microscope (SEM) and the interaction between chitosan and PVA was examined by Fourier Transform Infrared Spectroscopy (FTIR). The FTIR results indicate the changes in characteristics of the spectral peaks due to the formation of the intermolecular bonds between chitosan and PVA. The SEM morphology of the composites showed flat smooth surface that be a sign of uniform distribution of chitosan and PVA mixture throughout the films.

Silver-graphene oxide nanocomposite doping chitosan/PVA membrane for arsenic (III) elimination from aqueous solution

“…One of them shows that GO is present at around 235 nm, which corresponds to the n-π * transitions of C=O bonds and the π-π * transitions of aromatic C-C bonds [47]. The second one at 433 nm shows the presence of greenly synthesized silver nanoparticles coated with chitosan [48,65,66].…”

Competitive Detection of Volatile Compounds from Food Degradation by a Zinc Oxide Sensor

“…The organic substances considered in our tests are chemically different with different reagent groups, which makes the comparison of the sensor response more difficult: hexanal is an alkyl aldehyde, 1-octen-3-ol is an unsaturated secondary alcohol, and 1-pentanol is an aliphatic alcohol. In these cases, the mechanism of reaction involves the preferential interaction of hexanal with the ZnO surface, which occurs through the carbonyl group of the aldehyde [5,7], while in the case of alcohols, the main interaction occurs through the hydroxyl group. Both aldehyde and alcohol compounds interact with oxygen ions on the sensor's surface by oxidation reactions of the respective functional groups.…”

“…A possible application of MOX sensors in the food industry for meat quality control is the detection of hexanal, a typical decomposition product of meat formed during lipid oxidation in stored and packed meat products [2][3][4]. Hexanal, indeed, is considered an important indicator of the freshness status [5,6] of raw meat products. In a preliminary work, we compared three different MOX sensors for hexanal detection and we found that zinc oxide (ZnO), used as the detecting layer for resistive sensors, showed the best compromise between the sensing temperature (T = 523 K) and response amplitude [7,8].…”