Fabrication of a kinetically sprayed CuO ultra-thin film to evaluate CO gas sensing parameters

Choi, Dahyun; Kim, Hyojun; Son, Minhee; Kim, Hyungsub; Lee, Hee Chul; Lee, Caroline Sunyong

doi:10.1039/c9nj00289h

Cited by 13 publications

(9 citation statements)

References 35 publications

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“…Ponmudi et al [86] reported on the properties of thin Cr 2 O 3 :CuO films prepared by radio frequency magnetron sputtering technique, which suggests that the radio frequency magnetron sputtered Cr 2 O 3 :CuO thin films can perform efficiently as an ammonia gas sensor at RM. Choi et al [87] fabricated a CO gas sensor using CuO thin film deposition onto a flexible polyimide substrate using a kinetic spraying process. This work would play a pioneering role in disseminating knowledge in the field of CO gas sensors using a kinetic spraying method.…”

Section: Current and Future Challengesmentioning

confidence: 99%

Gas sensing materials roadmap

Wang

Zhang

et al. 2021

J. Phys.: Condens. Matter

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Gas sensor technology is widely utilized in various areas ranging from home security, environment and air pollution, to industrial production. It also hold great promise in non-invasive exhaled breath detection and an essential device in future internet of things. The past decade has witnessed giant advance in both fundamental research and industrial development of gas sensors, yet current efforts are being explored to achieve better selectivity, higher sensitivity and lower power consumption. The sensing layer in gas sensors have attracted dominant attention in the past research. In addition to the conventional metal oxide semiconductors, emerging nanocomposites and graphene-like two-dimensional materials also have drawn considerable research interest. This inspires us to organize this comprehensive 2020 gas sensing materials roadmap to discuss the current status, state-of-the-art progress, and present and future challenges in various materials that is potentially useful for gas sensors.

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Section: Current and Future Challengesmentioning

confidence: 99%

Gas sensing materials roadmap

Wang

Zhang

et al. 2021

J. Phys.: Condens. Matter

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“…Optical conductivity (𝜎 ) measurement is one of the most powerful methods on account of proving the progress of quasi-particle excitation and the size of the energy gap in a (super)conductor. Optical conductivity is determined by using the following relation: 40 𝜎 = (10) Where α is the absorption coefficient, n is the refractive index, and c is the velocity of light. Figure 7a shows the optical conductivity of CuO thin films associated with thickness.…”

Section: Optical Conductivity (𝝈 𝒐𝒑 )mentioning

confidence: 99%

“…1,7,8,9 In the case of gas sensing, CuO thin film-based sensors are particularly alluring due to their chemical stability, large water contact angle (>90 0 ), high sensitivity, faster response time, lower operating temperature as well as proven ability to detect diverse gases such as NO2, H2, CO, CO2, etc. 7,8,10 Carbon dioxide (CO has been extensively used as a refrigerant in fire extinguishers, life jackets also escalated life rafts, plastic, food packaging as well as in carbonated drinks, etc. 9 Therefore, reliable, selective, and fast detection of carbon dioxide gas appears to be the strict necessity for various industrial purposes.…”

Section: Introductionmentioning

confidence: 99%

Effects of withdrawal speed on the structural, morphological, electrical, and optical properties of CuO thin films synthesized by dip-coating for CO2 gas sensing

et al. 2021

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Copper oxide (CuO) thin films have been deposited on glass substrates by a facile sol-gel dipcoating technique with varying withdrawal speeds from 0.73 to 4.17 mm/s. The variation of film thickness manifested by dip-coating withdrawal speeds was investigated in detail to investigate its effect on the structural, morphological, opto-electrical, and wettability properties of CuO thin films for CO2 gas-sensing applications. The crystallinity, as well as phase purity of dip-coated CuO, were confirmed by both X-ray diffraction (XRD) and Raman spectral analyses. The surface morphology of the films characterized by the scanning electron microscopy (SEM) revealed that pore density decreases with the increase of withdrawal speeds and grain size is found to increase with the increase of film thickness corroborating the XRD results. The optical bandgap of dipcoated CuO films was estimated in the range of 1.47 -1.52 eV from the UV-VIS-NIR transmission data and it is found to decrease with the increment of Urbach tail states accompanied by the increase of film thickness. The ratio of the electrical and optical conductivity of CuO films is found to decrease with increasing withdrawal speeds due to the variation of carrier concentration. Among all the studied films, the sample deposited to a 0.73 mm/s withdrawal speed exhibited the highest crystallinity, porous morphology, highest pore density, opto-electrical conductivity as well as water contact angle, and therefore maximum gas sensing response of carbon dioxide (CO2) vapor in the air recorded at room temperature.

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“…The respondents rated their experiences on 4 features (stiffness, stickiness, familiarity, and preference) using a 11-point Likertscale, as respondents make contact with three different materials of three different thicknesses, at their elbow and shoulder, respectively. The results of the preference survey were analyzed using frequency analysis, comparison of means (t-test) (Choi et al, 2019), multiple regression (MR) (Mark and Goldberg, 1988), and structural model analysis, to investigate the differences between genders as well as how significant those differences are in terms of statistical point of view.…”

Section: Preference Surveymentioning

confidence: 99%

Evaluation of Materials Related to Gender-Preferences for the Application of Cooperative Robot Skin

Son¹,

Shin²,

Lee³

2021

J Appropr Technol

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This study evaluated gender preferences regarding the mechanical properties of polymers that are typically used as cooperative robot skin. Gender-based preferences of workers aged 20~30 and polydimethylsiloxane were examined according to the body parts which is most frequently in contact with the robot during operation. The factors influencing preference, i.e., stiffness and stickiness, as measured by strain rate and contact angle, respectively, were analyzed to compare genderbased differences. Female preferred stiffer materials with small strain rates while male preferred softer materials with large strain rates. As a result of evaluating mechanical properties of the materials to relate to gender-based preference, we found that female tended to prefer Dragon-skin with the lowest stickiness, and a low strain rate, during compressive creep tests. In contrast, male tended to prefer Ecoflex with high strain rate regardless of stickiness. Therefore, these results provide basis for material selection when considering cooperative robot skin.

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Fabrication of a kinetically sprayed CuO ultra-thin film to evaluate CO gas sensing parameters

Abstract: We have introduced a new fabrication process for a CO gas sensor using a kinetically sprayed Cu thin layer, followed by oxidation at 250 °C.

Cited by 13 publications

References 35 publications

Gas sensing materials roadmap

Gas sensing materials roadmap

Effects of withdrawal speed on the structural, morphological, electrical, and optical properties of CuO thin films synthesized by dip-coating for CO2 gas sensing

Evaluation of Materials Related to Gender-Preferences for the Application of Cooperative Robot Skin

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