Growth and morphology of Rh deposits on an alumina film under UHV conditions and under the influence of CO

Bäumer, Marcus; Frank, Martin M.; Libuda, Jörg; Stempel, Sascha; Freund, Hans‐Joachim

doi:10.1016/s0039-6028(97)00484-6

Cited by 48 publications

(32 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known from thermal evaporation technique that increase in the evaporation flux leads to the increase in the size and decrease in the coverage of the grown nanoparticles . Based on the SEM and UV–Vis absorption results of Ag nanoparticles grown at different growth cycles, we propose the growth mechanism.…”

Section: Resultsmentioning

confidence: 99%

SILAR grown Ag nanoparticles as an efficient large area SERS substrate

Shaikh

Sartale

2018

J Raman Spectroscopy

View full text Add to dashboard Cite

Ag nanoparticles having different size and coverage are grown on large area glass substrate (~10 cm2) using low cost successive ionic layer adsorption and reduction (SILAR) method. The SILAR parameters, such as reduction time and growth cycles are optimized to grow Ag nanoparticles with appropriate size and coverage showing maximum surface enhanced Raman scattering (SERS) enhancement of Rhodamine 6 G(R6G). For fixed growth cycles, the size and the coverage of the grown Ag nanoparticles are found to increase with the reduction time and then saturate. The size and coverage of the grown Ag nanoparticles monotonically increase with growth cycles. However, for higher growth cycles, the shape of Ag nanoparticles could not maintain their sphericity and became rock shaped/nonspherical particles, giving rise to intense quadruple plasmon resonance. The growth mechanism is proposed. Further, SERS activity of the grown Ag nanoparticles is studied for an industrial pollutant methylene blue (MB). The observed SERS enhancement factor (~109) for MB is much higher than the reported values in literature. Measured relative standard deviations values of Ag nanoparticles grown with optimum SILAR parameters suggest the excellent homogeneity and reproducibility of the SERS signal.

show abstract

Section: Resultsmentioning

confidence: 99%

SILAR grown Ag nanoparticles as an efficient large area SERS substrate

Shaikh

Sartale

2018

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…The few low resolution images obtained indicated a rough surface compared to the thinner films. The well known 5 Å thick film grown on NiAl(1 1 0) [26][27][28][29] was not formed by these procedures. Only thicker films (>7 Å average thickness) were observed.…”

Section: Experimental Methodsmentioning

confidence: 99%

Reactivities of ultrathin alumina films exposed to intermediate pressures of H2O: Substrate-mediated mechanism for growth and loss of surface order

et al. 2007

View full text Add to dashboard Cite

“…Recent studies, however, revealed that structural changes of the catalyst may occur not only during high-temperature reaction, but even during low-temperature adsorption. From the analysis of EXAFS, IR, XPS, and SPA-LEED results it was inferred that the adsorption of CO at 150-400 K caused the disruption of Rh nanoparticles to isolated Rh atoms which may be oxidized to Rh 1 by the OH groups of the support (5)(6)(7)(8)(9)(10)(11)(12)(13). As the disruption of Rh x can also occur on a hydroxyl-free substrate, a stabilization of the atomically dispersed Rh by oxygen vacancies was also suggested (14,15).…”

Section: Introductionmentioning

confidence: 99%