Surface-plasmon mediated photoluminescence from Ag-coated ZnO/MgO core–shell nanowires

Mayo, Daniel; Marvinney, Claire E.; Bililign, Ephraim; McBride, James R.; Mu, R.; Haglund, Richard F.

doi:10.1016/j.tsf.2013.11.131

Cited by 13 publications

(21 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to references [8a–d], Mayo et al . showed a bimodal MgO‐thickness‐dependent PL enhancement with a minimum at 40 nm MgO thickness and 15‐fold enhancement maxima at MgO thicknesses of 20 nm and 60 nm.…”

Section: Introductioncontrasting

confidence: 81%

“…showed a bimodal MgO‐thickness‐dependent PL enhancement with a minimum at 40 nm MgO thickness and 15‐fold enhancement maxima at MgO thicknesses of 20 nm and 60 nm. This bimodal enhancement which varies smoothly as a function of MgO thickness was not observed in the other studies,– and was attributed to the formation of optical cavity modes ,,. Thus the formation of optical cavity modes provides a mechanism for enhanced band‐edge PL beyond that due to ZnO surface passivation and band bending.…”

Section: Introductionmentioning

confidence: 66%

See 1 more Smart Citation

Effect of Material Structure on Photoluminescence of ZnO/MgO Core‐Shell Nanowires

et al. 2018

Self Cite

View full text Add to dashboard Cite

Zinc oxide (ZnO) nanowires are widely studied for use in ultraviolet optoelectronic devices, such as nanolasers and sensors. Nanowires (NWs) with an MgO shell exhibit enhanced band‐edge photoluminescence (PL), a result previously attributed to passivation of ZnO defects. However, we find that processing the ZnO NWs under low oxygen partial pressure leads to an MgO‐thickness‐dependent PL enhancement owing to the formation of optical cavity modes. Conversely, processing under higher oxygen partial pressure leads to NWs that support neither mode formation nor band‐edge PL enhancement. High‐resolution electron microscopy and density‐functional calculations implicate the ZnO m‐plane surface morphology as the key determinant of core‐shell structure and cavity‐mode optics. A ZnO surface with atomic steps along the m‐plane in the c‐axis direction stimulates the growth of a smooth MgO shell that supports guided‐wave optical modes and enhanced UV PL. On the other hand, a smoother ZnO surface leads to nucleation of a rough cladding layer which supports neither enhanced UV PL nor optical cavity modes. Finite‐element analysis shows a clear correlation between allowed Fabry‐Perot and whispering gallery modes and enhanced UV‐PL. These results point the way to fabricating ZnO/MgO core‐shell nanowires for more efficient UV nanolasers, scintillators, and sensors.

show abstract

Section: Introductioncontrasting

confidence: 81%

Section: Introductionmentioning

confidence: 66%

Effect of Material Structure on Photoluminescence of ZnO/MgO Core‐Shell Nanowires

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…This method produced multiple nanowire substrates during a single growth session, allowing the use of separate substrates for SERS and non‐SERS Raman analysis. The second method, a modified vapor‐solid method similar to that described by Mayo et al , was used to grow a nanowire substrate for demonstrating the reproducibility of surface enhancements on crystal violet Raman spectra. This method is described in detail in Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

“…Recent research has suggested that one promising platform is ZnO nanowires. ZnO is biocompatible, which allows it to interact with biological systems without adverse effects.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, ZnO possesses a high electron mobility and a very large refractive index (approximately 2.0 in the visible region) . These characteristics, in conjunction with atomically smooth and highly faceted hexagonal single‐crystal structure, allow ZnO nanowires to develop Fabry‐Perot and whispering gallery cavity modes and serve as waveguides for light, reducing signal loss due to scattering . ZnO nanowires also offer a greatly increased surface‐to‐volume ratio as compared with bulk ZnO, which is ideal for introducing surface enhancements by decorating the nanowire walls with metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sensing trace levels of molecular species in solution via zinc oxide nanoprobe Raman spectroscopy

Cook

Carson

Marvinney

et al. 2017

J Raman Spectroscopy

Self Cite

View full text Add to dashboard Cite

Surface‐enhanced Raman spectroscopy (SERS) has potential for unique clinical, environmental, and military applications, among many others, but it is limited by a rapid decrease in signal with distance from the sensing surface. For this reason, much study of SERS‐based biosensing involves chemical or physical adsorption of analytes to an active surface. Adsorption, however, limits the types of analytes that can be detected and detection sensitivity. The three‐dimensional closely packed architecture of zinc oxide (ZnO) nanowires decorated with silver nanoparticles increases SERS intensity, allowing for adsorption‐free biosensing. This approach greatly expands the potential applications of Raman spectroscopy as a biosensing technique. This work demonstrates a significant SERS enhancement from silver nanoparticle‐decorated ZnO nanoprobes to the Raman spectra of crystal violet, melamine, and adenine solutions. These enhancements were quantified by comparing the intensity of Raman peaks from each of the three solutions through ZnO nanowires decorated with silver nanoparticles with that through bare ZnO nanowires. Estimated enhancement of the Raman signal accounted for the volume difference between solution affected by SERS and solution sensed by the Raman system. More importantly, the detected SERS signal is from molecules in solution and unadsorbed to the sensing surfaces. This lack of adsorption was confirmed by tracking the SERS enhancement of a crystal violet Raman peak over time. This greatly enhances the value and flexibility of Raman spectroscopy as a detection technique for a wide variety of applications. Copyright © 2017 John Wiley & Sons, Ltd.

show abstract

Transient Study of Photoluminescence in Nanowaveguides Doped with Quantum Emitters and Metallic Nanoparticles

Brassem,

Singh,

Yastrebov

2024

ChemPhysChem

View full text Add to dashboard Cite

show abstract

Surface-plasmon mediated photoluminescence from Ag-coated ZnO/MgO core–shell nanowires

Cited by 13 publications

References 17 publications

Effect of Material Structure on Photoluminescence of ZnO/MgO Core‐Shell Nanowires

Effect of Material Structure on Photoluminescence of ZnO/MgO Core‐Shell Nanowires

Sensing trace levels of molecular species in solution via zinc oxide nanoprobe Raman spectroscopy

Transient Study of Photoluminescence in Nanowaveguides Doped with Quantum Emitters and Metallic Nanoparticles

Contact Info

Product

Resources

About