Influence of potassium permanganate on the anisotropic growth and enhanced UV emission of ZnO nanostructures using hydrothermal process for optoelectronic applications

Dixit, Tejendra; Bilgaiyan, Anubha; Palani, I. A.; Nakamura, Daisuke; Okada, Tatsuo; Singh, Vipul

doi:10.1007/s10971-015-3741-1

Cited by 29 publications

(53 citation statements)

References 32 publications

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“…It consists of two peaks; a sharp NBE around 385 nm and a broad DLE ranging from 450 nm to 750 nm centered around 580 nm. It is interesting to note that DLE got suppressed by incorporation of KMnO 4 during the growth which creates an oxygen rich environment [23]. Besides this a blue shift in UV peak was observed in samples grown with additive due to Burstein-Moss effect.…”

Section: Optical Characterizationmentioning

confidence: 94%

“…The nanorods were uniformly distributed over the entire substrate. The mechanism of growth of ZNR with KMnO 4 addition has been discussed in detail in our previous report [23]. Briefly, presence of additive has strongly influenced hydrolysis of HMTA and ceased formation of dumbbells, while the oxygen rich environment in the nutrient solution has led to the passivation of the defects.…”

Section: Surface Morphology and Structural Characterization -mentioning

confidence: 97%

“…Samples were rotated at a speed of 10 revolutions per minute (rpm) to ensure uniform deposition of Pt over it. During the growth process, initially seed layer was coated over Glass/Cr:Pt samples followed by hydrothermal growth of ZNRs as reported in our previous work [23]. In summary, an equimolar solution of Zinc acetate and ethanolamine in 2-methoxy ethanol has been spun coated followed by annealing for seed layer preparation.…”

Section: Synthesis Of Znr Enzyme Immobilization and Quantificationmentioning

confidence: 99%

See 2 more Smart Citations

Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

Shukla¹,

Pramila²,

Palani³

et al. 2017

J. Phys.: Conf. Ser.

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Abstract:In this paper, ZnO Nanorods (ZNR) have been synthesized over Platinum (Pt) coated glass substrate with in-situ addition KMnO 4 during hydrothermal growth process. Significant variation in ZnO nanostructures was observed by KMnO 4 addition during the growth. Glucose oxidase was later immobilized over ZNRs. The asprepared ZNRs were further utilized for glucose detection by employing amperometric electrochemical transduction method. In order to optimize the performance of the prepared biosensor two different immobilization techniques i.e. physical adsorption and cross linking have been employed and compared. Further investigations suggest that immobilization via cross linking method resulted in the improvement of the biosensor performance, thereby significantly affecting the sensitivity and linear range of the fabricated biosensor. Among the two types of biosensors fabricated using ZNR, the best performance was shown by cross linked electrodes. The sensitivity for the same was found to be 17.7 mA-cm -2 -M -1 , along with a wide linear range of 0.5-8.5 mM.

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Section: Optical Characterizationmentioning

confidence: 94%

Section: Surface Morphology and Structural Characterization -mentioning

confidence: 97%

Section: Synthesis Of Znr Enzyme Immobilization and Quantificationmentioning

confidence: 99%

See 1 more Smart Citation

Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

Shukla¹,

Pramila²,

Palani³

et al. 2017

J. Phys.: Conf. Ser.

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“…PMMA, polyaniline, Al 2 O 3 , ZnS, MgO, (3) plasma treatment, (4) thermal annealing in the Ar environment, (5) post growth treatment with H 2 O 2 and most importantly (6) metal coating on ZnO thin lms and nanostructures. [11][12][13][14][15][16][17][18][19][20][21] Much effort has been focused in the area of improved UV emission of ZnO thin lms and nanostructures using metal capping since Okamoto et al demonstrated in their leading work the dramatic emission enhancement from the Agcapped InGaN/GaN quantum well. 22 The primary reason behind the emission enhancement is surface plasmon (SP) resonance arising due to the local electric eld enhancement near the surface of the metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 Subsequently, a solution of equimolar (0.1 M) zinc nitrate hexahydrate and HMTA in DI water was prepared. In the next step, 2.5 mM KMnO 4 was added and the solution was stirred before sample immersion and then kept at 110 C for 4 h for nanorod growth.…”

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confidence: 99%

Insights into non-noble metal based nanophotonics: exploration of Cr-coated ZnO nanorods for optoelectronic applications

2018

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Herein, the room temperature photoluminescence and Raman spectra of hydrothermally grown ZnO nanorods coated with Cr are investigated for optoelectronic applications. A thorough examination of the photoluminescence spectra of Cr coated ZnO nanorods showed the suppression of deep level emissions by more than twenty five times with Cr coating compared to that of pristine ZnO nanorods. Moreover, the underlying mechanism was proposed and can be attributed to the formation of Schottky contacts between Cr and ZnO resulting in defect passivation, weak exciton-plasmon coupling, enhanced electric field effect and formation of hot carriers due to interband transitions. Interestingly, with the increase in sputtering time, the ratio of the intensities corresponding to the band gap emission and deep level emission was observed to increase from 6.2 to 42.7, suggesting its application for UV only emission.Further, a planar photodetector was fabricated (Ag-ZnO-Ag planar configuration) and it was observed that the dark current value got reduced by more than ten times with Cr coating, thereby opening up its potential for transistor applications. Finally, Cr coated ZnO nanorods were employed for green light sensing. Our results demonstrated that ZnO nanorods decorated with Cr shed light on developing stable and high-efficiency non-noble metal based nanoplasmonic devices such as photodetectors, phototransistors and solar cells.

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Interface Analysis of CuO/ZnO Heterojunction for Optoelectronic Applications: An Experimental and Simulation Study

Sumanth

Mishra

Rao

et al. 2023

Physica Status Solidi (a)

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Material interfaces are essential building blocks for a wide variety of emerging technologies. Particularly, well‐defined and optimized heterostructures serve as the foundation for developing materials for innovative optoelectronic applications. The distinctive features of heterojunctions has recently attracted the attention of the optoelectronics community, prompting a rise in the construction of modern devices. We present a solution‐based method for developing a heterojunction made of copper oxide nanorods coated with zinc oxide thin films. Coating ZnO thin films on vertically oriented CuO nanorods results in the development of a ZnO/CuO heterojunction configuration, which exhibits outstanding optoelectronic capabilities like broadband absorption, white light emission. Additionally, systematic ab‐initio computations have been done in order to comprehend the impact on various optical and electrical properties. It is observed that defects play a very crucial role in determining the quantum efficiency as well as improved visible to NIR absorption. Moreover, formation of energy levels near conduction bands in the presence of vacancies lead to broad absorption in the UV‐Visible region and therefore greater than 60% quantum efficiency over the range 390 nm to 800 nm is observed. Therefore, the presented work serves as the foundation for additional design and optimization techniques for oxide heterojunctions and emerging applications.This article is protected by copyright. All rights reserved.

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Influence of potassium permanganate on the anisotropic growth and enhanced UV emission of ZnO nanostructures using hydrothermal process for optoelectronic applications

Cited by 29 publications

References 32 publications

Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

Effect of immobilization technique on performance ZnO nanorods based enzymatic electrochemical glucose biosensor

Insights into non-noble metal based nanophotonics: exploration of Cr-coated ZnO nanorods for optoelectronic applications

Interface Analysis of CuO/ZnO Heterojunction for Optoelectronic Applications: An Experimental and Simulation Study

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