Growth and study of c-axis-oriented vertically aligned ZnO nanorods on seeded substrate

Katiyar, Anu; Kumar, Nishant; Shukla, R. K.; Srivastava, Anchal

doi:10.1007/s10854-021-06121-z

Cited by 11 publications

(5 citation statements)

References 73 publications

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“…In particular, the ZnO-NC sample exhibits a preferential growth in (002) direction as evidenced by the high intensity of the peak at 34.4°. [69] Moreover, the ZnO-ClR sample also shows a preference growth along the c-axis. According to previous studies, preferential growth directions depend on the pH of the initial solution and the counterion used.…”

Section: Characterization Resultsmentioning

confidence: 99%

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Growth of ZnO thin Films from Depleted Batteries for Water Remediation

Melia,

Gallegos,

Juncal

et al. 2024

ChemistrySelect

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ZnO films were obtained by electrodeposition technique from commercial Zn2+ solutions and those obtained from spent alkaline batteries. The type of counterion and pH impact directly on the structural, morphological, and optical properties of the electrodeposited ZnO films. The morphological and crystallographic orientation differences observed by X‐ray diffraction (XRD) analysis and high‐resolution field emission scanning electron microscopy (HR‐FESEM), demonstrates the influence of the type and origin of precursors used in the ZnO synthesis process. Those samples grown from commercial nitrate solutions exhibit nanocolumns revealing a preferential growth in the (002) direction. On the other hand, random growth (hexagonal plates, agglomerations, clusters, etc.) is observed in samples obtained through recycled solutions. All deposited samples achieved a transparency close to 80 % and an optical band gap of around 3.30 eV. The as‐deposited films were evaluated toward the photodegradation capacity of methylene blue (MB) for potential technological applications. Results exhibit that samples prepared from recycled ZnCl2 solutions presented more than 80 % degradation per mass of ZnO. This work demonstrates a virtuous circle since ZnO films are deposited by a facile and scalable technique from discarded batteries and used for MB photodegradation. Furthermore, the simplicity of recovery of these substrates after application makes them an attractive and pragmatic option for a range of water treatment applications. Synopsis: Zinc from depleted alkaline batteries is reused to obtain ZnO thin films that remove contaminating dyes from water.

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Section: Characterization Resultsmentioning

confidence: 99%

“…The observed peaks indicate a successful deposition of h‐ZnO for all the films. In particular, the ZnO‐NC sample exhibits a preferential growth in (002) direction as evidenced by the high intensity of the peak at 34.4° [69] …”

Section: Resultsmentioning

confidence: 99%

Growth of ZnO thin Films from Depleted Batteries for Water Remediation

Melia,

Gallegos,

Juncal

et al. 2024

ChemistrySelect

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“…The past published reports on PDs indicate that in most of the PDs, GaN and silicon have been used as absorbing layers. – However, due to the blurring of optical signals between neighboring pixels, cross-talk of optical signals, low band gap, poor efficiency, and high cost of these materials, researchers take interest in other semiconductors like ZnS, CdS, V 2 O 5 , CeO 2 , CuO, ZnO, etc. ,– Out of these semiconducting materials, ZnO is the most preferable material for making PDs because of its unique properties like wide direct band gap (∼3.37 eV), large exciton energy (60 meV), nontoxicity, transparency, and thermal stability. – The most interesting property is its large excitonic binding energy of 60 meV at room temperature, which makes ZnO an efficient light emitter. – Also, the crystal growth of ZnO is easier than that in most semiconductors. Due to these unique desirable properties, ZnO can be essentially used as a high-response photodetector (PD) which could be fabricated with both Schottky and ohmic contacts .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Singh,

Ambedkar,

Tyagi

et al. 2023

ACS Omega

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Photodetection plays an essential role in the visiblelight zone and is important in modern science and technology owing to its potential applications in various fields. Fabrication of a stable photodetector remains a challenge for researchers. We demonstrated a high-response/recovery and self-powered undoped ZnO (UZO) and Cu-doped ZnO (CZO) thin film-based visible-light photodetector fabricated on a cost-effective Si substrate using reactive cosputtering. The structural, morphological, and optical properties of CZO and UZO thin films have been examined using X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and photoluminescence spectroscopy. The results of the CZO/n-Si photodetector compared with those of the undoped ZnO (UZO)/n-Si photodetector show that the CZO/n-Si exhibits a higher on/off ratio, responsivity, and detectivity than UZO/n-Si. Also, the CZO/ n-Si photodetector shows high stability and reproducibility over 20 cycles after 180 days. A relative study of CZO/n-Si-and UZO/n-Si-based photodetectors reveals the enhanced performance of the CZO/n-Si photodetector, which has a high on/off ratio of ∼300 with a high specific detectivity of 2.8 × 10 10 Jones for 75 mW visible light. The prepared self-powered CZO/n-Si/Ag thin film-based visible-light photodetector paves the way for the development of high-performance photodetector designs.

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“…Comparing the properties of interfaces created by various deposition techniques is beneficial to understanding the interface structure and function. Several techniques were used for depositing thin films of ZnO 17 , 18 , 41 , 42 and Ag/ZnO nano-heterostructures. 9 , 24 , 29 , 43 , 44 Nevertheless, unless particular care is taken, the interface of Ag/ZnO nanostructures does not have a specific orientation, obscuring the effect of the native crystal polarity.…”

Section: Introductionmentioning

confidence: 99%

“…Comparing the properties of interfaces created by various deposition techniques is beneficial to understanding the interface structure and function. Several techniques were used for depositing thin films of ZnO ,,, and Ag/ZnO nano-heterostructures. ,,,, Nevertheless, unless particular care is taken, the interface of Ag/ZnO nanostructures does not have a specific orientation, obscuring the effect of the native crystal polarity. Also, due to the high surface-to-volume ratio in nano-heterostructures, the consequences of surface defects can mask other effects resulting from a “bulk”, or specifically the interface.…”

Section: Introductionmentioning

confidence: 99%

Chemistry and Charge Trapping at the Interface of Silver and Ultrathin Layers of Zinc Oxide

Rahamim

Cohen

Edri

2021

ACS Appl. Mater. Interfaces

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Zinc oxide, a wide-band-gap semiconductor, shows intriguing optoelectronic properties when coupled with Ag. Specifically, an absorbance band in the visible range that is not apparent in the separated materials emerges when the interface is formed. Interestingly, photoexcitation of this “interface band” or band-to-band results in a counterintuitive photovoltaic response when a supra/sub-band-gap light is shone. To investigate the origin of this absorbance band and photovoltaic response, we studied in detail the energy-band alignment of ultrathin layers of ZnO (3–60 nm) with Ag. Our analysis indicated that an ‘electrostatic potential cliff’ is formed within the first 1–2 nm of ZnO. In addition, oxygen vacancies, presumably generated by Ag x O–Zn bonds, form mid-gap acceptor states within these first few nm. Both effects facilitate a valence band-to-defect state optical transition that is confined to the interface region. The second type of defects—hole-trap states associated with zinc hydroxide—are spread throughout the ZnO layer and dominate the supra-band-gap photovoltaic response. These findings have potential implications in emerging technologies such as photocatalytic Ag/ZnO heterostructures that will utilize the long-lived charges for chemical work or other optoelectronic applications.

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Growth and study of c-axis-oriented vertically aligned ZnO nanorods on seeded substrate

Cited by 11 publications

References 73 publications

Growth of ZnO thin Films from Depleted Batteries for Water Remediation

Growth of ZnO thin Films from Depleted Batteries for Water Remediation

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Chemistry and Charge Trapping at the Interface of Silver and Ultrathin Layers of Zinc Oxide

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