Metal‐nanoparticle‐coating‐induced enhancement and weakening of resonant Raman scattering in ZnO: effect of surface electric field

Liu, H. F.; Huang, Anqi; Tripathy, S.; Chua, Soo-Jin

doi:10.1002/jrs.2991

Cited by 19 publications

(6 citation statements)

References 31 publications

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“…It is well reported that this peak has strong dependence on the surface electric field and hence can be modulated using metal NPs. 79 Interestingly both broadening and increase in the intensity of the peak corresponding to E 1 (LO) mode was observed in case of Cr coated ZnO NRs (Cr coating for 10 seconds), clearly demonstrating the fact that electron–phonon coupling strength is diminishing in case of coating of Cr. The peaks at 525 and 564 cm −1 can be assigned to 2LA and A 1 (LO) modes respectively.…”

Section: Resultsmentioning

confidence: 85%

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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Section: Resultsmentioning

confidence: 85%

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

2018

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“…Because the more amount of metal nanoparticles in metal/ZnO heterostructures induce the more electrons transfer between Au/Ti and ZnO nanobelts. The improved Raman scattering activity is mainly attributed to the strong local electromagnetic field enhancement on the surface of ZnO nanobelts due to the LSP coupling resonance effect of adjacent metal nanoparticles, and dependent on the metal nanoparticle size [40][41][42][43][44][45][46].…”

Section: Resultsmentioning

confidence: 99%

Optical study of Au/Ti/Ni/Mg-nanoparticles decorated zinc oxide heterostructures: size effect induced modulation of work function

Ren¹,

Zhao²,

Yuan³

et al. 2019

J. Phys. D: Appl. Phys.

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The development of the novel semiconductor heterogeneous functional materials is playing an ever more important role in materials and eﬃcient devices with new properties and functions. In this work, heterostructures of Au/Ti/Ni decorated zinc oxide nanobelts were synthesized. The amount and diameter of metal nanoparticles were controlled by the sputtering time or the deposition time. The photoluminescence of metal/ZnO heterostructures has been investigated. Very strong enhancement of near-band-edge emission and simultaneous attenuation of visible emission were observed for ZnO nanobelts decorated with Au, Ti and Ni nanoparticles. But both the NBEUV and DL emission intensities of Ni/ZnO heterostructures decrease dramatically initially. A novel mechanism is proposed to explain observed kinds of experimental results based on characteristic of metal nanoparticles, LSPR, Purcell effects and work function change of nanosize induced. The Mg decorated zinc oxide nanobelts were synthesized for the first time. Then the entire mechanism was testified by the investigation on Mg/ZnO and Ni/ZnO heterostructures due to its much lower and higher work functions compared with that of ZnO nanobelts, respectively. The mechanism will facilitate the technical application of metal-nanoparticles decorated heterostructures, and be very useful for the creation of highly efficient optoelectronic devices.

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“…Nano-sized particles and presence of imperfections and/or impurities result in breakdown of phonon momentum selection rules, thus making some forbidden vibration modes to contribute to Raman scattering. The relative intensity of this contribution is higher in the case of ZnO/Ag [26].…”

Section: Xps and Raman Analysesmentioning

confidence: 88%

Enhanced optical response of ZnO/Ag nanocolloids prepared by a picosecond laser

D’Urso

Santangelo²,

Spadaro

et al. 2016

Journal of Luminescence

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Metal‐nanoparticle‐coating‐induced enhancement and weakening of resonant Raman scattering in ZnO: effect of surface electric field

Cited by 19 publications

References 31 publications

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

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

Optical study of Au/Ti/Ni/Mg-nanoparticles decorated zinc oxide heterostructures: size effect induced modulation of work function

Enhanced optical response of ZnO/Ag nanocolloids prepared by a picosecond laser

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