Thickness and annealing effects on thermally evaporated InZnO thin films for gas sensors and blue, green and yellow emissive optical devices

Sathish, S.; Jamlos, Mohd Faizal; Ahmad, Mardiana Idayu; Bellan, Chandar Shekar; Sivaraj, M.

doi:10.1016/j.optmat.2016.05.049

Cited by 6 publications

(3 citation statements)

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“…It was evident that the surface morphology changed upon thermal treatment, and that surface roughness increased. This type of modified surface is associated with optimized trace gas detection due to shifts in the absorption spectra of the gas sensors [ 34 ], as can be seen in the bar graph ( Figure 3 ) and the AFM images ( Figure 4 ). Moreover, the AFM results in Figure 4 indicate that the thermal treatment has an effect on the structure and surface area on gas sensing films, leading to an increase of surface roughness.…”

Section: Resultsmentioning

confidence: 99%

“…According to existing research, the temperature used in thin film preparation affects the morphology of the film’s surface [ 33 ]. Therefore, increasing the surface area of films generally enhances the rate of a chemical vapor reaction [ 34 ], which leads to the significant increase in the sensor’s response, as shown in Figure 3 .…”

Section: Resultsmentioning

confidence: 99%

“…This process affects optical properties, such as absorption spectrum, that are related to the sensitivity of the sensors. For example, optimization of the grain size of thin-surface-layers can be expanded to provide greater surface area of the gas sensor for interaction with the absorbed analyte molecules [ 34 ]. Such research has yielded many useful fabrication processes for development of better optical gas sensors.…”

Section: Introductionmentioning

confidence: 99%

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Development of Organic-Inorganic Hybrid Optical Gas Sensors for the Non-Invasive Monitoring of Pathogenic Bacteria

Kladsomboon

Thippakorn

Seesaard

2018

Sensors

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Hybrid optical gas sensors, based on different organic and inorganic materials, are proposed in this paper, with the aim of using them as optical artificial nose systems. Three types of organic and inorganic dyes, namely zinc-porphyrin, manganese-porphyrin, and zinc-phthalocyanine, were used as gas sensing materials to fabricate a thin-film coating on glass substrates. The performance of the gas sensor was enhanced by a thermal treatment process. The optical absorption spectra and morphological structure of the sensing films were confirmed by UV-Vis spectrophotometer and atomic force microscope, respectively. The optical gas sensors were tested with various volatile compounds, such as acetic acid, acetone, ammonia, ethanol, ethyl acetate, and formaldehyde, which are commonly found to be released during the growth of bacteria. These sensors were used to detect and discriminate between the bacterial odors of three pathogenic species (Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa) grown in Luria-Bertani medium. Based on a pattern recognition (PARC) technique, we showed that the proposed hybrid optical gas sensors can discriminate among the three pathogenic bacterial odors and that the volatile organic compound (VOC) odor pattern of each bacterium was dependent on the phase of bacterial growth.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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