Controlling the sharpness of ZnO tetrapods by restricted zinc oxidation in the open air: a low turn-on field emitter stabilized by graphene

Maiti, Soumen; Maiti, Uday Narayan; Behera, B. C.; Pal, Shreyasi; Chattopadhyay, Kalyan Kumar

doi:10.1039/c3tc30775a

Cited by 17 publications

(22 citation statements)

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“…[1][2][3][4][5][6][7][8] In addition to the functional integration or rational designing of new materials, generation of improved or unusual features in these coupled systems has progressively advanced their auspicious adoption in multitudes of electronic and optoelectronic applications. [9][10][11][12] In such a scenario, focused research effort aiming at the creation of hetero-nanostructures having dual or multiple geometries with high mechanical robustness, optimum size and accurate chemical composition via suitable methodology is of paramount importance. Amongst the metal oxide semiconductors, functionalized forms based on ZnO are widely recognized as the materials of huge economic impact, where the documented rich morphological assortment boost up their usage perspectives in applied fields such as UV detectors, 13,14 piezoelectric nano generators, 15 and solar cells.…”

Section: Introductionmentioning

confidence: 99%

Low temperature solution processed ZnO/CuO heterojunction photocatalyst for visible light induced photo-degradation of organic pollutants

et al. 2015

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The possibility of integrating manifold functionalities, coupled with various associated noble interface phenomena in the hierarchical nanoforms, either comprised of geometrical intricacies or achieved via the rational coupling of several components, has made them immensely pertinent from both research and technological aspects. Here, an oxide based nanostructure hybrid has been realized by integrating low bandgap copper oxide nanosheet with high bandgap one dimensional zinc oxide nanowires on a flexible carbon cloth as well as on a flat substrate. These bandgap modulated hybrid nanostructures are generated for the efficient absorption of visible light, targeting their possible use in waste water management. Our work presents a novel ambient condition protocol for morphological tuning in the nanoscale or their organization in a hierarchical structure. Environmental remediation through catalytic activity under the visible light irradiation of the synthesized samples was inspected using both anionic and cationic dyes (methyl orange and Rhodamine B, respectively) as the model contaminants, where the optimized heterostructure exhibits significantly better performance than the mono component oxides. Such enhanced performance could be explained by the formation of favorable staggered gap multiple p-n junctions at ZnO/CuO interface, which in turn retards the photogenerated electron-hole pair recombination within the heterostructure. The signature of successful p-n junction formation at ZnO nanorod/CuO nanosheet interface has been identified via current-voltage measurements with a conducting tip AFM in contact mode. The creative designing of novel heterojunctions adopting this protocol will pave the way for the utilization of the entire visible light range: thus, offering potential in solar energy conversion devices.

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Section: Introductionmentioning

confidence: 99%

Low temperature solution processed ZnO/CuO heterojunction photocatalyst for visible light induced photo-degradation of organic pollutants

et al. 2015

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“…[1][2][3] Amongst various potential aspects of eld emission, eld assisted electron emission from this complex hierarchy is a topic that has been persistently investigated for the last decade in which the documented reports were primarily conned to carbon-or oxide-based inorganic materials. 2,4,5 However, high-temperature processing, costly deposition equipment and complex synthesis protocols associated with these nanoforms have managed to cast a bleak shadow over its potential commercial usage. Additionally, compared with the abundance of reports on inorganic hierarchy, documentation on organic materials is quite sparse.…”

Section: Introductionmentioning

confidence: 99%

Scalable approach for the realization of garland shaped 3D assembly of CuTCNQ nanorods: an efficient electron emitter

Pal

Maiti

et al. 2014

J. Mater. Chem. C

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“…The value of β is known to depend on the geometry, crystal structure, and density of ZnO nanostructures. [ 42,47 ] The moderately high value of β in our case is mainly because of the high aspect ratio and reasonably aligned arrays of ZnO NRs as can be seen from Figure 2a.…”

Section: Resultsmentioning

confidence: 63%

On‐Chip Mercury‐Free Deep‐UV Light‐Emitting Sources with Ultrahigh Germicidal Efficiency

Sharma

Tan

Shendre

et al. 2021

Advanced Optical Materials

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In the current COVID‐19 scenario, there is an urgent need for developing efficient and mercury‐free deep‐ultraviolet (deep‐UV) light sources for disinfection applications. AlGaN‐based light‐emitting diodes (LEDs) may be considered as an alternative, but due to their inherent low efficiencies in the deep‐UV spectral region, significant developments are required to address efficiency issues. Here, a mercury‐free chip‐size deep‐UV light source is shown which is enabled by high‐vacuum chip‐scale cavity sealing overcoming the limitations of both mercury lamps and deep‐UV LEDs. These deep‐UV chips are cathodoluminescence based, in which a cavity is created with high vacuum integrity for efficient field‐emission. These chips demonstrate optical output power ≥20 mW (efficiency ≈4%) and, owing to the spectral overlap of phosphor cathodoluminescence spectra and germicidal effectiveness curve, resulted in log 6 (99.9999%) germicidal efficiency. Additionally, these chips offer high reliability, “instant” ON/OFF capability, high operational lifetimes, and low‐temperature dependence with complete design freedom.

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Controlling the sharpness of ZnO tetrapods by restricted zinc oxidation in the open air: a low turn-on field emitter stabilized by graphene

Cited by 17 publications

References 50 publications

Low temperature solution processed ZnO/CuO heterojunction photocatalyst for visible light induced photo-degradation of organic pollutants

Low temperature solution processed ZnO/CuO heterojunction photocatalyst for visible light induced photo-degradation of organic pollutants

Scalable approach for the realization of garland shaped 3D assembly of CuTCNQ nanorods: an efficient electron emitter

On‐Chip Mercury‐Free Deep‐UV Light‐Emitting Sources with Ultrahigh Germicidal Efficiency

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