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  • 1
    Online Resource
    Online Resource
    Evaluating Different TiO2 Nanoflower-Based Composites for Humidity Detection
    MDPI AG ; 2022
    In:  Sensors Vol. 22, No. 15 ( 2022-08-03), p. 5794-
    Details
    In: Sensors, MDPI AG, Vol. 22, No. 15 ( 2022-08-03), p. 5794-
    Abstract: Unique three-dimensional (3D) titanium dioxide (TiO2) nanoflowers (TFNA) have shown great potential for humidity sensing applications, due to their large surface area-to-volume ratio and high hydrophilicity. The formation of a composite with other materials could further enhance the performance of this material. In this work, the effect of different types of composites on the performance of a TNFA-based humidity sensor was examined. NiO, ZnO, rGO, and PVDF have been explored as possible composite pairing candidates with TiO2 nanoflowers, which were prepared via a modified solution immersion method. The properties of the composites were examined using field emission electron spectroscopy (FESEM), X-ray diffractometry (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), current-voltage (I-V) analysis, Hall effect measurement, and contact angle measurement. The performance of the humidity sensor was assessed using a humidity sensor measurement system inside a humidity-controlled chamber. Based on the result, the combination of TiO2 with rGO produced the highest sensor response at 39,590%. The achievement is attributed to the increase in the electrical conductivity, hydrophilicity, and specific surface area of the composite.
    Type of Medium: Online Resource
    ISSN: 1424-8220
    URL: Article
    DOI: 10.3390/s22155794
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2052857-7
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  • 2
    Online Resource
    Online Resource
    Effect of Precursors on the Growth and Physiochemical Properties of Bio-mimetic ZnFe2O4 Nanocomposites for Photoelectrochemical Application
    Penerbit Universiti Kebangsaan Malaysia (UKM Press) ; 2020
    In:  Sains Malaysiana Vol. 49, No. 12 ( 2020-12-31), p. 3219-3228
    Details
    In: Sains Malaysiana, Penerbit Universiti Kebangsaan Malaysia (UKM Press), Vol. 49, No. 12 ( 2020-12-31), p. 3219-3228
    Abstract: Zinc ferrite (ZnFe2O4) photocatalysts have been prepared with different types of zinc precursors using the bio-mimetic synthesis method. The kapok fibre (Ceiba pentandra (L.) Gaertn) used as a sacrificial template. The physiochemical of prepared bio-mimetic materials were carried out thoroughly in this work. The FESEM analysis in mimetic zinc ferrite catalysts shows a distinctly different structural transition under different precursors conditions. The acetate precursor formed a hollow tubular structure while other precursors formed a hierarchal fibril structure. X-ray diffraction analysis showed a distinctly different phase transition while UV-Vis spectroscopy recorded variable optical properties beneath different precursor conditions. The EDX and ATR-FTIR spectroscopy confirmed the formation of the pure composite after the annealing process. Different type of precursors that used have leads to tuneable of the magnetic properties of the prepared materials. Electrophoretic deposition (EPD) method has been used to fabricate the synthesized materials as photo-electrodes on the FTO substrate then evaluated for photoelectrochemical (PEC) application. Changing the precursors in the preparation method show a significant effect on physicochemical and PEC performance. The morphology and surface structure of the prepared catalysts are correlated with the alteration of the precursors, then attributed to the charge transfer properties of the photocurrent density in PEC system. The bio-templated zinc ferrite catalysts are promising photoanode in the photocatalytic activities. It is interesting to note that the various forms of multi-structure such as hollow fibril core-shell offers an enormous impact in designing active photocatalyst with superior performance.
    Type of Medium: Online Resource
    ISSN: 0126-6039
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.17576/jsm-2020-4912
    DOI: 10.17576/jsm
    DOI: 10.17576/jsm-2020-4912-33
    Language: Unknown
    Publisher: Penerbit Universiti Kebangsaan Malaysia (UKM Press)
    Publication Date: 2020
    detail.hit.zdb_id: 2751030-X
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  • 3
    Online Resource
    Online Resource
    Physicochemical properties of surface modified ZnFe 2 O 4 nanocomposite incorporated with bio‐templated kapok fiber for photoelectrochemical application
    Wiley ; 2021
    In:  Surface and Interface Analysis Vol. 53, No. 7 ( 2021-07), p. 637-649
    Details
    In: Surface and Interface Analysis, Wiley, Vol. 53, No. 7 ( 2021-07), p. 637-649
    Abstract: Surface‐modified zinc ferrite nanocomposites were successfully prepared thru ultrasonic impregnation technique by taking kapok fiber as a bio‐template. This work demonstrates a fast preparation method to produce the bio‐templated ZnFe 2 O 4 composite photocatalyst. The templating method for photocatalyst is favorable due to the benefit of a large surface area for solar harvesting activities in the photoelectrochemical (PEC) system. Comprehensive physicochemical analyses have successfully determined the unique properties of the prepared catalysts. The pure mimetic fibrous catalysts were successfully fabricated as photoelectrodes on the fluorine tin oxide substrate using electrophoretic deposition technique for PEC measurement. The ranging ratio of precursors used to prepare bio‐templated zinc ferrite catalysts shows an effect on their surface structure then influences the photocurrent density performance of PEC analysis. The ZF1 photoanode at 1:1 Zn/Fe ratio has generated the highest photocurrent density of 58 μA cm −2 at 0.7 V vs. Ag/AgCl compare to other samples in 0.5 M Na 2 SO 4 electrolyte solution under 100 mW cm −2 light irradiation. The high photocurrent density was attributed to the enhancement in light‐harvesting properties, fine surface structure, and high charge transfer properties that correlate with the composite ratio's alteration. The bio‐templated zinc ferrite photocatalysts are a promising photoanode in PEC activities.
    Type of Medium: Online Resource
    ISSN: 0142-2421 , 1096-9918
    URL: Issue
    URL: Article
    DOI: 10.1002/sia.v53.7
    DOI: 10.1002/sia.6950
    RVK:
    ZG 1100
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2023881-2
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  • 4
    Online Resource
    Online Resource
    Optimization of Aluminum Dopant Amalgamation Immersion Time on Structural, Electrical, and Humidity-Sensing Attributes of Pristine ZnO for Flexible Humidity Sensor Application
    MDPI AG ; 2022
    In:  Chemosensors Vol. 10, No. 11 ( 2022-11-17), p. 489-
    Details
    In: Chemosensors, MDPI AG, Vol. 10, No. 11 ( 2022-11-17), p. 489-
    Abstract: This study synthesized pristine and aluminum (Al)-doped zinc oxide (Al:ZnO) nanostructures through a simplistic low-temperature ultrasonicated solution immersion method. Al:ZnO nanostructures were synthesized as a sensing material using different immersion times varying from two to five hours. The Al:ZnO nanostructured-based flexible humidity sensor was fabricated by employing cellulose filter paper as a substrate and transparent paper glue as a binder through a simplistic brush printing technique. XRD, FESEM, HRTEM, EDS, XPS, a two-probe I–V measurement system, and a humidity measurement system were employed to investigate the structural, morphological, chemical, electrical, and humidity-sensing properties of the pristine ZnO and Al:ZnO nanostructures. The structural and morphological analysis confirmed that Al cations successfully occupied the Zn lattice or integrated into interstitial sites of the ZnO lattice matrix. Humidity-sensing performance analysis indicated that the resistance of the Al:ZnO nanostructure samples decreased almost linearly as the humidity level increased, leading to better sensitivity and sensing response. The Al:ZnO-4 h nanostructured-based flexible humidity sensor had a maximum sensing response and demonstrated the highest sensitivity towards humidity changes, which was noticeably superior to the other tested samples. Finally, this study explained the Al:ZnO nanostructures-based flexible humidity sensor sensing mechanism in terms of chemical adsorption, physical adsorption, and capillary condensation mechanisms.
    Type of Medium: Online Resource
    ISSN: 2227-9040
    URL: Article
    DOI: 10.3390/chemosensors10110489
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2704218-2
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