Size dependence of electron-phonon coupling in ZnO nanowires

Wang, Rongping; Xu, Guoyue; Jin, Peng

doi:10.1103/physrevb.69.113303

Cited by 274 publications

(191 citation statements)

References 20 publications

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“…Wang et al have reported that the magnitudes of the ratio of second-to first-order Raman scattering cross section increase with MW diameter, and it has been unambiguously demonstrated that electron-phonon coupling increases with nanocrystal size due to the Fröhlich interaction, which become significant for larger interaction volumes [43,44]. As mentioned above, our MWs with an average diameter of about 1-2 μm are much thicker than those reported previously, which may cause strong electronphonon coupling and result in high ratios of second-to first-order Raman scattering cross section.…”

Section: Resultsmentioning

confidence: 99%

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Dai

Zhou

et al. 2010

Nano Res.

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Pure ZnO hexagonal microwires and Fe(Ⅲ)-doped ZnO microwires (MWs) with a novel rectangular cross section were synthesized in a confined chamber by a convenient one-step thermal evaporation method. An oriented attachment mechanism is consistent with a vapor-solid growth process. Photoluminescence (PL) and Raman spectroscopy of the Fe(Ⅲ)-doped ZnO MWs and in situ spectral mappings indicate a quasi-periodic distribution of Fe(Ⅲ) along a one-dimensional (1-D) superlattice ZnO:ZnFe 2 O 4 wire, while PL mapping shows the presence of optical multicavities and related multimodes. The PL spectra at room temperature show weak near-edge doublets (376 nm and 383 nm) and a broad band (450-650 nm) composed of strong discrete lines, due to a 1-D photonic crystal structure. Such a 1-D coupled optical cavity material may find many applications in future photonic and spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Dai

Zhou

et al. 2010

Nano Res.

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“…Several resonant Raman investigation have been carried out on ZnO single crystals [11], as well as on nanoparticles [12,13] exhibiting LO-phonon overtones up to several orders.…”

Section: Introductionmentioning

confidence: 99%

Excitation energy dependence of electron–phonon interaction in ZnO nanoparticles

Sahoo

Sivasubramanian

Dhara

et al. 2008

Solid State Communications

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Raman spectroscopic investigations are carried out on ZnO nanoparticles for various photon energies. Intensities of E 1 -LO and E 2 modes exhibit large changes as the excitation energy varied from 2.41 to 3.815 eV, signifying substantially large contribution of Frohlich interaction to the Raman polarizability as compared to deformation potential close to the resonance. Relative strength of these two mechanisms is estimated for the first time in nanoparticles and compared with those in the bulk.

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“…The 2LO/1LO ratio is the parameter to specify the strength of the electronphonon interaction. 41,42 The intensity ratios of 2LO/1LO are about 0.2, 1.2, 1.5, 2.7 and 3.2 for ZnS-P, ZnS-873, ZnS-973, ZnS-1073 and ZnS-1173 nanocrystals, respectively. The value of the ratio was found to increase with the size of ZnS nanoparticles.…”

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confidence: 99%

Visible emission characteristics from different defects of ZnS nanocrystals

Wang

Shi

Feng

et al. 2011

Phys. Chem. Chem. Phys.

171

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Various sized ZnS nanocrystals were prepared by treatment under H 2 S atmosphere. Resonance Raman spectra indicate that the electron-phonon coupling increases with increasing the size of ZnS. Surface and interfacial defects are formed during the treatment processes. Blue, green and orange emissions are observed for these ZnS. The blue emission (430 nm) from ZnS without treatment is attributed to surface states. ZnS sintered at 873 K displays orange luminescence (620 nm) while ZnS treated at 1173 K shows green emission (515 nm). The green luminescence is assigned to the electron transfer from sulfur vacancies to interstitial sulfur states, and the orange emission is caused by the recombination between interstitial zinc states and zinc vacancies. The lifetimes of the orange emission are much slower than that of the green luminescence and sensitively dependent on the treatment temperature. Controlling defect formation makes ZnS a potential material for photoelectrical applications.

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Size dependence of electron-phonon coupling in ZnO nanowires

Cited by 274 publications

References 20 publications

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Excitation energy dependence of electron–phonon interaction in ZnO nanoparticles

Visible emission characteristics from different defects of ZnS nanocrystals

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