UV-light enhanced high sensitive hydrogen (H2) sensor based on spherical Au nanoparticles on ZnO nano-structured thin films

Kumar, G. Sudesh; Li, Xuejin; Du, Yu; Geng, Yanquan; Hong, Xueming

doi:10.1016/j.jallcom.2019.05.227

Cited by 47 publications

(21 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S9). Also, compared to other works 80 – 83 , our prepared UV sensor depicted relatively high UV response and excellent repeatability, which are attributed to the high crystal quality and fewer defects in ZnO.…”

Section: Resultsmentioning

confidence: 67%

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Yergaliuly

Soltabayev

Kalybekkyzy

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Zinc oxide (ZnO) is one of the most promising metal oxide semiconductor materials, particularly for optical and gas sensing applications. The influence of thickness and solvent on various features of ZnO thin films deposited at ambient temperature and barometric pressure by the sequential ionic layer adsorption and reaction method (SILAR) was carefully studied in this work. Ethanol and distilled water (DW) were alternatively used as a solvent for preparation of ZnO precursor solution. Superficial morphology, crystallite structure, optical and electrical characteristics of the thin films of various thickness are examined applying X-ray diffraction (XRD) system, scanning electron microscopy, the atomic force microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, Hall effect measurement analysis and UV response study. XRD analysis confirmed that thin films fabricated using ethanol or DW precursor solvents are hexagonal wurtzite ZnO with a preferred growth orientation (002). Furthermore, it was found that thin films made using ethanol are as highly crystalline as thin films made using DW. ZnO thin films prepared using aqueous solutions possess high optical band gaps. However, films prepared with ethanol solvent have low resistivity (10–2 Ω cm) and high electron mobility (750 cm2/Vs). The ethanol solvent-based SILAR method opens opportunities to synthase high quality ZnO thin films for various potential applications.

show abstract

Section: Resultsmentioning

confidence: 67%

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Yergaliuly

Soltabayev

Kalybekkyzy

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…S1 shows a representative XRD pattern obtained from a ZnO seed layer grown by ALD. It shows the peaks corresponding to (100), (002), (101) and (102) planes of hexagonal wurtzite ZnO (JCDPS Card # 89-1397) 28 . The wurtzite structure of ZnO contains polar and nonpolar facets with different surface energies, which is responsible for the faster growth rate of one crystallographic facet over another, namely anisotropic growth 29 .…”

Section: Resultsmentioning

confidence: 99%

Electrowetting-on-dielectric characteristics of ZnO nanorods

Kim

Mirzaei

Kim

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Herein, we report the electrowetting-on-dielectric (eWoD) characteristics of Zno nanorods (nRs) prepared via the hydrothermal method with different initial Zn 2+ concentrations (0.03, 0.07, and 0.1 M). Diameter of the resultant ZnO NRs were 50, 70 and 85 nm, respectively. Contact angle (CA) measurements showed that the Teflon-coated ZnO NRs with diameters of 85 nm prepared from the 0.1 M solution had the highest CA (137°). During the EWOD studies, on the application of a voltage of 250 V, the water CA decreased to 78°, which demonstrates the potential application of this material in EWOD electronics. Furthermore, we explained the relationship between the applied voltage and CA based on the substrate nanostructures and our newly developed NR-on-film wetting model. In addition, we further validated our model by introducing the homo-composite dielectric structure, which is a composite of thin layered ZnO/Teflon and nano-roded ZnO/Teflon. Electrowetting (EW) is defined as the decrease in contact angle (CA) when a sufficiently large driving voltage is applied to the interface of solid/liquid. In direct EW, a voltage is used between a liquid and an electrode. Charges and dipoles redistribute at the interface between the liquid and solid, which changes the surface tension, leading to a decrease in the CA of the liquid droplets. However, direct EW can electrolyze the liquid before any change in the water contact angle (WCA), which limits its application 1. To overcome this issue, electrowetting-on-dielectric (EWOD) can be used. In this technique, a dielectric material is sandwiched between the liquid of interest and the underlying electrode (Fig. 1). EWOD is very effective for significantly changing the CA, because the dielectric layer effectively blocks the process of charge transfer at the liquid/electrode interface, which eliminates unwanted electrolysis 2. Therefore, EWOD is used to facilitate EW on solids, for practical applications. Although EWOD devices permit a large CA change, they generally need a high driving voltage. The dielectric layer blocks the transfer of electrons, while sustaining high voltage at the interface, which results in an electric double layer (EDL) formation in the presence of the applied voltage. When a hydrophobic dielectric material is used, the large initial WCA can result in a large change in the WCA 3. The advantages of EWOD include low power consumption, large WCA change, and fast response. It is therefore promising for diverse applications, including lab-on-chips 4 , liquid lenses 5 , optical waveguides 6 , electronic displays 7, 8 , microprism arrays 9 , and smart microbatteries 10. SiO 2 is a highly popular material for EWOD studies 11 because of its excellent compatibility with the microelectronic industry. In our previous study 12 , we investigated the EWOD properties of electrospray-deposited SiO 2 layers and found that the WCA of the optimal SiO 2 layer underwent a hydrophobic-to-hydrophilic transition under a driving voltage of 150 V in air. A novel EWOD mechanism, wherein the ...

show abstract

“…Moreover, Au catalyzes CO oxidation and selective oxidation of alcohols owing to the excellent adsorption and/or dissociation properties of hydrogen and oxygen molecules. Furthermore, hydrogen‐sensing performance of ZnO nanostructured material showed significantly improved results to decorate Au 31–33 or Pt 34–36 nanoparticles, respectively, and given the experiences of the previous studies, to decorate these combined nanoparticles, it can be estimated that hydrogen sensor showing excellent performance can be fabricated. As the sensing performance of MOS nanostructure‐based chemiresistive hydrogen sensors depends on the adsorption of hydrogen and oxygen on the surface of sensing materials, the hydrogen‐sensing performance of these sensors can be improved significantly via bimetallic AuPt nanoparticle decoration.…”

Section: Introductionmentioning

confidence: 93%

AuPt bimetal‐codecorated ZnO nanowire‐based hydrogen sensors for detecting low concentration hydrogen gas with high response and selectivity

Min

Kim

et al. 2022

Bulletin Korean Chem Soc

View full text Add to dashboard Cite

ZnO nanowires decorated with bimetallic AuPt nanoparticles were synthesized using the vapor-liquid-solid method, followed by sputtering and thermal annealing, to fabricate highly sensitive and selective sensors for detecting ppb scale hydrogen gas. The proposed sensor demonstrated a clear pattern enough to recognize, even for 100 ppb hydrogen gas. The sensing responses of the pristine and AuPt bimetal-codecorated ZnO nanowire-based sensors were 1.09 and 7.3 for 100 ppb hydrogen gas, respectively. The sensing response of the proposed sensor is seven times as the decoration of AuPt nanoparticles. Furthermore, the proposed sensor exhibited excellent sensing selectivity for various interfering gases including ethanol, acetone, toluene, CO, and H 2 S. The proposed sensor shows excellent sensing performance because of synergistic effect of decorated AuPt, which play the role of catalysts. Therefore, hydrogen sensors showing superior sensing performance can be fabricated using this nanomaterial, and its advanced sensing performances are analyzed in this study.

show abstract

UV-light enhanced high sensitive hydrogen (H2) sensor based on spherical Au nanoparticles on ZnO nano-structured thin films

Cited by 47 publications

References 62 publications

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Electrowetting-on-dielectric characteristics of ZnO nanorods

AuPt bimetal‐codecorated ZnO nanowire‐based hydrogen sensors for detecting low concentration hydrogen gas with high response and selectivity

Contact Info

Product

Resources

About