Effect of ammonia on morphology, wettability and photoresponse of ZnO nanorods grown by hydrothermal method

Lv, Jianguo; Yan, Pengpeng; Zhao, Min; Sun, Yue; Shang, Fei; He, Gang; Zhang, Miao; Sun, Zhaoqi

doi:10.1016/j.jallcom.2015.07.068

Cited by 26 publications

(3 citation statements)

References 34 publications

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“…Above results indicate that the functional ZnO material is a good choice for self-cleaning coating. Until now, many research works have been reported about the hydrophobic/hydrophilic reversible process caused by light-controlled method for ZnO-based nanostructures 17 18 19 20 . ZnO has direct wide band gap (3.37 eV), high exciton binding energy (60 meV) and optical transparency in the visible light, thus, ZnO is an expected material for many novel applications, for example, piezoelectric transducers, transparent thin film transistors, chemical biosensors 21 22 , solar cells and ultraviolet (UV) detectors 23 24 25 .…”

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confidence: 99%

Internal stress induced natural self-chemisorption of ZnO nanostructured films

Chi

Wei

2017

Sci Rep

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The energetic particles bombardment can produce large internal stress in the zinc oxide (ZnO) thin film, and it can be used to intentionally modify the surface characteristics of ZnO films. In this article, we observed that the internal stress increased from −1.62 GPa to −0.33 GPa, and the naturally wettability of the textured ZnO nanostructured films changed from hydrophobicity to hydrophilicity. According to analysis of surface chemical states, the naturally controllable wetting behavior can be attributed to hydrocarbon adsorbates on the nanostructured film surface, which is caused by tunable internal stress. On the other hand, the interfacial water molecules near the surface of ZnO nanostructured films have been identified as hydrophobic hydrogen structure by Fourier transform infrared/attenuated total reflection. Moreover, a remarkable near-band-edge emission peak shifting also can be observed in PL spectra due to the transition of internal stress state. Furthermore, our present ZnO nanostructured films also exhibited excellent transparency over 80% with a wise surface wetting switched from hydrophobic to hydrophilic states after exposing in ultraviolet (UV) surroundings. Our work demonstrated that the internal stress of the thin film not only induced natural wettability transition of ZnO nanostructured films, but also in turn affected the surface properties such as surface chemisorption.

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confidence: 99%

Internal stress induced natural self-chemisorption of ZnO nanostructured films

Chi

Wei

2017

Sci Rep

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“…The transient photocurrent responses usually provide future evidence of electron‐hole transfer mechanism . Figure shows the typical current‐time characteristics of the TiO 2 , Ag/TiO 2 , 9‐GQDs/Ag/TiO 2 , and 12‐GQDs/Ag/TiO 2 under visible light irradiation.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photoresponse and photocatalytic activities of graphene quantum dots sensitized Ag/TiO₂ thin film

Wang

et al. 2018

J Am Ceram Soc

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TiO2 thin films were fabricated through hydrothermal method. Silver nanoparticles were loaded on TiO2 thin films via photoreduction technique. Subsequently, the graphene quantum dots (GQDs) were spin‐coated on the Ag/TiO2 nanocomposites thin films. The crystal structure, surface morphology and UV‐vis absorbance were tested by XRD, SEM and ultraviolet‐visible spectrophotometer. These results indicated that Ag nanoparticles and GQDs are anchored on the TiO2 nanorods. Absorbance of Ag/TiO2 and GQDs/Ag/TiO2 nanocomposite thin films have been extended into the visible region. Visible‐light response of the samples were investigated by electrochemical workstation. The photoresponse of the sample can be enhanced by sensitization of the Ag nanoparticles and GQDs. The enhanced visible‐light response may be due to the surface plasmon resonance of silver nanoparticles and visible absorbance of GQDs. The highest photocatalytic activity has been observed in the 9‐GQDs/Ag/TiO2 composite thin film. The efficient charge separation and transportation can be achieved by introducing the Ag nanoparticles and GQDs in the TiO2 thin film.

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“…Further, HTP method is an economical and simple for a growth of ZnO and it obtains diverse morphologies and diverse properties in ZnO nanostructures with high quality [12,13]. Recently, many studies have been conducted to study the influential factors on ZnO-NRs such as growth temperature [14], time [15], PH [16], seed layer [17], and substrate [18][19][20], etc. In this study, ZnO-NRs arrays were fabricated with aligned uniform on p-type Si (100), and glass substrates using the HTP at various temperature for the same time without any metal catalyst.…”

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Effect of Substrate and Growth temperature on Zinc Oxide nanorods via Hydrothermal Processing

Mohammed¹,

Kasim²

2017

JK-Physics

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In this paper, the hydrothermal processing (HTP) was employed to synthesize Zinc oxide nanorods (ZnO-NRs) arrays on p-type Si(100), and glass substrates at 95℃, and 120 ℃. The X-ray diffraction(XRD) measurements confirm that all prepared films are polycrystalline with hexagonal structure and orientation on plane c-axis (002) as shown in FESEM images. The intensity of peak (2ө =34.2°) was increased and its full width at half maximum (FWHM) decreased with the increase of temperature due to the increase in their particles size. The images of field emission scanning electron microscopy (FESEM) show that ZnO-NRs on Si substrate gives a better result from the glass substrate with an aspect ratio (17.95, and17.43) for the prepared samples at (120°C, and 95°C) , respectively. The growth temperature effect is clear onto average diameter, average length and aspect ratio, where they increased with increasing temperature. The optical measurement shows that the peak of absorption increased with increasing temperature while the reflection spectra decreased. The band gap of ZnO-NRs on Si was determined from the reflection spectra while for glass substrate was determined from absorption spectra.

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Effect of ammonia on morphology, wettability and photoresponse of ZnO nanorods grown by hydrothermal method

Cited by 26 publications

References 34 publications

Internal stress induced natural self-chemisorption of ZnO nanostructured films

Internal stress induced natural self-chemisorption of ZnO nanostructured films

Enhanced photoresponse and photocatalytic activities of graphene quantum dots sensitized Ag/TiO₂ thin film

Effect of Substrate and Growth temperature on Zinc Oxide nanorods via Hydrothermal Processing

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Effect of ammonia on morphology, wettability and photoresponse of ZnO nanorods grown by hydrothermal method

Cited by 26 publications

References 34 publications

Internal stress induced natural self-chemisorption of ZnO nanostructured films

Internal stress induced natural self-chemisorption of ZnO nanostructured films

Enhanced photoresponse and photocatalytic activities of graphene quantum dots sensitized Ag/TiO2 thin film

Effect of Substrate and Growth temperature on Zinc Oxide nanorods via Hydrothermal Processing

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Enhanced photoresponse and photocatalytic activities of graphene quantum dots sensitized Ag/TiO₂ thin film