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  • 1
    Online Resource
    Online Resource
    Highly sensitive humidity sensor based on cadmium selenide quantum dots-polymer composites: synthesis, characterization, and effect of UV/ozone treatment
    Springer Science and Business Media LLC ; 2023
    In:  Journal of Materials Science: Materials in Electronics Vol. 34, No. 21 ( 2023-07)
    Details
    In: Journal of Materials Science: Materials in Electronics, Springer Science and Business Media LLC, Vol. 34, No. 21 ( 2023-07)
    Abstract: This work describes the rational design of thin film-based cadmium selenide quantum dots (CdSe) mixed with conductive polyvinylidene fluoride (PVDF), inducing PVDF-CdSe composite for potential resistive humidity-sensing applications. The effect of UV/ozone treatment on surface hydrophilicity and sensing properties was investigated. AFM has been performed to examine the prepared films' texture, distribution over the surface, and size. Overall, the hydrophilicity of the developed films increases with UV radiation exposure time, leading to enhanced water vapor absorption without deforming the film surface. The sensor's sensitivity is improved with increasing UV radiation exposure. The electrical response of the PVDF-CdSe humidity sensors after 30 min of UV/ozone treatment reveals that at higher humidity levels (i.e.,  〉  80% RH), the sensors exhibit an irregular response. However, at 20 min, treatment increases sensitivity and a linear change in impedance response concerning humidity level change compared to other samples. The hysteresis response was divided into two regions: the lower region, between 30 and 60% RH—where the maximum hysteresis loss was calculated to be 3%. While the higher area between 60 and 90% RH, where the maximum estimated hysteresis loss of the PVDF-CdSe sensor is around 14%, the UV/ozone treatment of the PVDF-CdSe nanocomposite film was found to enhance the sensing film's hydrophilicity without deforming the surface of the as-prepared PVDF-CdSe as well as the UV-treated films validates a potential for novel humidity sensors.
    Type of Medium: Online Resource
    ISSN: 0957-4522 , 1573-482X
    URL: Article
    DOI: 10.1007/s10854-023-10955-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2016994-2
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  • 2
    Online Resource
    Online Resource
    Synthesis of In Situ Photoinduced Halloysite-Polypyrrole@Silver Nanocomposite for the Potential Application in Humidity Sensors
    MDPI AG ; 2020
    In:  Nanomaterials Vol. 10, No. 7 ( 2020-07-21), p. 1426-
    Details
    In: Nanomaterials, MDPI AG, Vol. 10, No. 7 ( 2020-07-21), p. 1426-
    Abstract: Halloysite-polypyrrole-silver nanocomposite has been prepared via in situ photopolymerizations of pyrrole in the presence of silanized halloysite and silver nitrate as a photoinitiator. The halloysite nanoclay (HNT) was modified using the hydrogen donor silane coupling agent (DMA) in order to provide anchoring sites for the polypyrrole/silver composite (PPy@Ag). The mass loadings for both PPy and Ag have been estimated to be 21 and 26 wt%, respectively. The anchored Ag particles were found in the metallic state. The resulting PPy@Ag-modified silanized HNT has been evaluated for the potential application for impedance humidity sensors. HNT-DMA-PPy@Ag nanocomposite with different weight % of PPy@Ag (0.25 wt%, 0.5 wt%, and 1 wt%) was deposited on the pre-patterned interdigital Indium Tin Oxide (ITO) electrodes by spin coating technique. The addition of Ag nanoparticles within the nanocomposite enhances the hydrophilicity of the sensing film, which improves the sensitivity of the humidity sensors. The HNT-DMA-PPy@Ag (0.5 wt%) nanocomposite-based impedance sensors showed good sensitivity and lowered hysteresis as compared to the other ratios of the composite. The maximum calculated hysteresis loss of the HNT-DMA-PPy@Ag (0.5 wt%)-based humidity sensor is around 4.5% at 80% RH (relative humidity), and the minimum hysteresis loss estimated to be 0.05% at 20% RH levels. The response and recovery time of HNT-DMA-PPy@Ag (0.5 wt%) nanocomposite-based impedance sensors were found to be 30 and 35 s, respectively. The interesting humidity-dependent impedance properties of this novel composite make it promising in humidity sensing.
    Type of Medium: Online Resource
    ISSN: 2079-4991
    URL: Article
    DOI: 10.3390/nano10071426
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2662255-5
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  • 3
    Online Resource
    Online Resource
    Polyvinylpyridine–carbon dots composite-based novel humidity sensor
    Springer Science and Business Media LLC ; 2023
    In:  Applied Physics A Vol. 129, No. 10 ( 2023-10)
    Details
    In: Applied Physics A, Springer Science and Business Media LLC, Vol. 129, No. 10 ( 2023-10)
    Abstract: This work describes the rational design of thin films based on PVP-modified carbon dots for potential resistive humidity sensing application, prepared via spin coating on ITO substrates. The modified carbon dots were manufactured from graphite waste and modified with PVP to test the synergetic effect of the two materials. The surface hydrophilicity, morphology, and sensing properties were studied. AFM has been performed to investigate the prepared films’ texture and distribution over the surface. Overall, the hydrophilicity of the prepared films increases with concentration, leading to enhanced water vapor absorption on the surface of the sensing film. As a result, the sensor’s sensitivity is improved with the increasing concentration of PVP–CDs. The electrical response of the PVP–CDs composite film sensor shows a higher sensitivity level above 80% RH sensor with an irregular response; however, the concentration of 0.5 wt%, higher sensitivity, and linear change in impedance response was noted compared to other concentrations.
    Type of Medium: Online Resource
    ISSN: 0947-8396 , 1432-0630
    URL: Article
    DOI: 10.1007/s00339-023-06908-3
    RVK:
    UA 9001.A
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1398311-8
    detail.hit.zdb_id: 184232-8
    detail.hit.zdb_id: 283365-7
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  • 4
    Online Resource
    Online Resource
    Facile preparation of N-S co-doped graphene quantum dots (GQDs) from graphite waste for efficient humidity sensing
    Elsevier BV ; 2021
    In:  Sensors and Actuators B: Chemical Vol. 328 ( 2021-02), p. 129058-
    Details
    In: Sensors and Actuators B: Chemical, Elsevier BV, Vol. 328 ( 2021-02), p. 129058-
    Type of Medium: Online Resource
    ISSN: 0925-4005
    URL: Article
    DOI: 10.1016/j.snb.2020.129058
    RVK:
    ZG 1100
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1500731-5
    detail.hit.zdb_id: 1021505-0
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