The effect of growth temperature of seed layer on the structural and optical properties of ZnO nanorods

Gautam, Khyati; Singh, Inderpreet; Bhatnagar, P. K.; Peta, Koteswara Rao

doi:10.1016/j.spmi.2016.03.001

Cited by 37 publications

(15 citation statements)

References 35 publications

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“…Therefore, the replacement of TiO 2 with a one-dimensional nanometer ZnO array significantly improves the electron transfer efficiency. The ZnO one-dimensional nanorod arrays are superior to ZnO thin films in terms of optical properties and fast electron transport properties [10][11][12]. When n-type ZnO is combined with a P-type semiconductor, ZnO enhances the visible light absorption as an anti-reflection photon window and also serves as an n-type semiconductor material that generates carriers and provides a depletion layer [13,14] and a built-in electric field.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnO@MoS2 Nanocomposite Heterojunction Arrays and Their Photoelectric Properties

Jile

Chen

et al. 2020

Micromachines

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In this paper, ZnO@MoS2 core-shell heterojunction arrays were successfully prepared by the two-step hydrothermal method, and the growth mechanism was systematically studied. We found that the growth process of molybdenum disulfide (MoS2) was sensitively dependent on the reaction temperature and time. Through an X-ray diffractometry (XRD) component test, we determined that we prepared a 2H phase MoS2 with a direct bandgap semiconductor of 1.2 eV. Then, the photoelectric properties of the samples were studied on the electrochemical workstation. The results show that the ZnO@MoS2 heterojunction acts as a photoanode, and the photocurrent reaches 2.566 mA under the conditions of 1000 W/m2 sunshine and 0.6 V bias. The i-t curve also illustrates the perfect cycle stability. Under the condition of illumination and external bias, the electrons flow to the conduction band of MoS2 and flow out through the external electrode of MoS2. The holes migrate from the MoS2 to the zinc oxide (ZnO) valence band. It is transferred to the external circuit through the glass with fluorine-doped tin oxide (FTO) together with the holes on the ZnO valence band. The ZnO@MoS2 nanocomposite heterostructure provides a reference for the development of ultra-high-speed photoelectric switching devices, photodetector(PD) devices, and photoelectrocatalytic technologies.

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Section: Introductionmentioning

confidence: 99%

Fabrication of ZnO@MoS2 Nanocomposite Heterojunction Arrays and Their Photoelectric Properties

Jile

Chen

et al. 2020

Micromachines

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“…Meanwhile, the types of seed layer that used either monoethanolamine (MEA) or potassium hydroxide (KOH), and their effects on the resulting ZnO NRs, were compared and analyzed by Kashif et al [28]. Another method to optimize the ZnO NR's properties was by the preheating treatment for the seed layer [29][30][31][32]. Dou et al reported another way to increase photovoltaic performance of ZnO NR-based DSC, by using a Ga-doped seed layer [33].…”

Section: Introductionmentioning

confidence: 99%

Growth of Zinc Oxide Nanorods with the Thickness of Less than or Equal to 1 μm through Zinc Acetate or Zinc Nitrate for Perovskite Solar Cell Applications

Bramantyo

Murakami

Okuya

et al. 2019

Journal of Engineering

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Arrays of zinc oxide (ZnO) nanorod (NR) were fabricated in a vertical axis direction through the two-step method of seed layer’s deposition and growth of the NR. The seed layer was applied by spin coating with a three-time repetition (n) and rotational speed (v) at 3000 rpm. After the seed layer had grown, ZnO NRs were grown with a growth solution made by combining one zinc source with one hydroxide source. There were two different zinc sources, i.e., zinc acetate dehydrate and zinc nitrate hexahydrate and, for comparison, zinc acetate (ZA) and zinc nitrate (ZN) were each combined with the same hydroxide source, hexamethylenetetramine (HMT). Later, the growth solutions were processed by the chemical bath deposition (CBD) method using a waterbath machine. The CBD method was started at room temperature until it reached the designated temperature at 85°C. At that point, the growth time was calculated from the zero-minute condition. It was found that ZnO NRs had already grown at a thickness of about 100 nm for both ZA and ZN sources. The growth time varied at 15, 60, 90, and 120 minutes after the zero-minute point. By using two separate and independent zinc sources while growing ZnO NRs at various growth periods, several ZnO NRs’ thicknesses were controlled. According to a paper by Lee et al., the lower thickness of ZnO NRs boosted the charge transfer properties of perovskite solar cells (PSCs) because the series resistance between ZnO/perovskite interfaces was lessened. Scanning electron microscopy (SEM) images were observed to analyze the morphological shape of the ZnO NRs. X-ray diffraction (XRD) profiles were characterized to obtain the data for ZnO NR crystallinity. Full width at half maximum (FWHM) analysis was performed at the (002) ZnO peak to calculate the crystal size of the peak. From the results, the smallest crystallite sizes for ZnO NRs grown from ZA and ZN sources were 10.70 nm and 19.29 nm, respectively, which would be the most suitable condition for PSC application.

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“…The high intensity and narrow thickness of the peaks, mainly in relation to the planes (100), (002) and (101) in the XRD indicate a polycrystalline structural characteristic of the ZnO nanoparticles powder. 37 From the XRD pattern it is evident the absence of peaks that do not belong to the wurtzite phase, this demonstrates that precipitation synthesis formed ZnO nanoparticles without other structures that differ from the ZnO wurtzite hexagon. Moreover, the excess of ions (OH À ) at pH between 10 and 11 can generate the formation of ZnO in zinc hydroxide however, the hydrogen potential measurement of the ZnOQD colloid resulted in pH 9.4, which corroborates the presence of an only phase on XRD.…”

Section: Photocatalytic Assaymentioning

confidence: 97%

Surface modification of ZnO quantum dots coated polylactic acid knitted fabric for photocatalytic application

Cabral

Galvão

Silva

et al. 2022

J of Applied Polymer Sci

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In this work, ZnO quantum dots (ZnOQD) were synthesized by Sol–gel synthesis and impregnated on polylactic acid (PLA) knitted fabric through self‐assembly of different cycles from layer‐by‐layer (LBL) using cationic agent Poly(diallydimethylammonium chloride) (PDDA). Then, morphological, chemical and photocatalytic properties were studied. The results demonstrate that the synthesis provided 8 nm Wurtzite‐type ZnO nanoparticles. In addition, X‐ray photoelectron spectroscopy (XPS) spectra, X‐ray diffraction (XRD) and scanning electron microscopy (SEM) proved the inclusion of ZnOQD on the surface of PLA matrix, which allowed the evaluation of its photocatalytic properties, therefore, coated PLA with five cycles of ZnOQD obtained the best result for degrading 85% of the dye Rhodamine B (RhB) in 360 min under UV radiation, in addition to its reusability for another five cycles of photocatalytic activity.

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The effect of growth temperature of seed layer on the structural and optical properties of ZnO nanorods

Cited by 37 publications

References 35 publications

Fabrication of ZnO@MoS2 Nanocomposite Heterojunction Arrays and Their Photoelectric Properties

Fabrication of ZnO@MoS2 Nanocomposite Heterojunction Arrays and Their Photoelectric Properties

Growth of Zinc Oxide Nanorods with the Thickness of Less than or Equal to 1 μm through Zinc Acetate or Zinc Nitrate for Perovskite Solar Cell Applications

Surface modification of ZnO quantum dots coated polylactic acid knitted fabric for photocatalytic application

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