Quasiquenching size effects in gold nanoclusters embedded in silica matrix

Dhara, Sandip; Kesavamoorthy, R.; Magudapathy, P.; Premila, M.; Panigrahi, B. K.; Nair, K. G. M.; Wu, Chunxia; Chen, K.H; Chen, L.C

doi:10.1016/s0009-2614(03)00104-0

Cited by 28 publications

(17 citation statements)

References 18 publications

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“…Consequently the LFRS mode is supposed to show a red shift [23,42]. In contrast, the LFRS Smaller particle size reduces the diffusion length and increases the reaction site for the ion due to its high surface area.…”

Section: Unlike 25 Nm Nps the Qds Exhibit A Completely Different Ramamentioning

confidence: 96%

Electrochemical supercapacitor performance of SnO2 quantum dots

Bonu

Gupta

Chandra

et al. 2016

Electrochimica Acta

102

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Metal oxide nanostructures are widely used in energy applications like super capacitors and Liion battery. Smaller size nanocrystals show better stability, low ion diffusion time, higher-ion flux and low pulverization than bigger size nanocrystals during electrochemical operation.Studying the distinct properties of smaller size nanocrystals such as quantum dots (QDs) can improve the understanding on reasons behind the better performance and it will also help in using QDs or smaller size nanoparticles (NPs) more efficiently in different applications. Aqua stable pure SnO 2 QDs with compositional stability and high surface to volume ratio are studied as an electrochemical super capacitor material and compared with bigger size NPs of size 25 nm.Electron energy-loss spectroscopic study of the QDs revealed dominant role of surface over the bulk. Temperature dependent study of low frequency Raman mode and defect Raman mode of QDs indicated no apparent volume change in the SnO 2 QDs within the temperature range of 80-300 K. The specific capacitance of these high surface area and stable SnO 2 QDs has showed only 9% loss while increasing the scan rate from 20 mV/S to 500 mV/S. Capacitance loss for the QDs is less than 2% after 1000 cycles of charging discharging, whereas for the 25 nm SnO 2 NPs, the capacitance loss is 8% after 1000 cycles. Availability of excess open volume in QDs leading to no change in volume during the electro-chemical operation and good aqua stability is attributed to the better performance of QDs over bigger sized NPs.

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Section: Unlike 25 Nm Nps the Qds Exhibit A Completely Different Ramamentioning

confidence: 96%

Electrochemical supercapacitor performance of SnO2 quantum dots

Bonu

Gupta

Chandra

et al. 2016

Electrochimica Acta

102

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show abstract

“…Evidently, the properties of nanocomposites will depend on the size, density, and the position of Au NPs [9]. Nowadays these nanocomposites can be fabricated using several technological approaches, such as the sol-gel process, metaldielectric co-sputtering deposition, metal-ion implantation of dielectrics and in situ growth [10][11][12][13]. Nevertheless, they cannot guarantee the homogeneous size distribution of NPs, as well as their spatial arrangement, especially for the samples with a large surface area.…”

Section: Introductionmentioning

confidence: 99%

Thermal Penetration of Gold Nanoparticles into Silicon Dioxide

Ilkiv

Kotlyar

Amel'chuk³

et al. 2017

Acta Phys. Pol. A

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“…LFRS has been used earlier for the study of size distribution of Au and Ag nanoclusters embedded in silica glass. 9,10 Synthesis of Alloy Metal Nanoclusters in Silica Glass by Sequential Ion Implantation 425 In view of this, we have analyzed the samples using this technique.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Alloy Metal Nanoclusters in Silica Glass by Sequential Ion Implantation

et al. 2007

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High fluence low energy negative ion implantation has been used to synthesize embedded metal nanoclusters of Au, Ag and Sb in silica glass. The Au-and Ag-implanted samples showed peaks, corresponding to surface plasmon resonance (SPR) in the optical absorption (OA) spectra, confirming the formation of metallic nanoparticles in the matrix. No SPR peak was observed in case of Sb-implanted samples which is attributed to the absence of pure metallic precipitates which could be detected in the OA spectrum. Low frequency Raman scattering (LFRS) measurements also confirm this. Cross-sectional transmission electron microscopy has been used to infer about the size distribution of the nanoparticles. Sequential implantations of Au and Ag or Au and Sb have been found to result in SPR peaks at locations in between those for nanoparticles of the constituent atoms, indicating the formation of alloy nanoparticles in the system. In case of the Au + Ag system, Rutherford backscattering spectrometry has been used to infer about the composition of the nanoparticles in terms of the concentrations of the metallic constituents. A direct, one-to-one correspondence between the SPR peak position and composition has been observed.

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Quasiquenching size effects in gold nanoclusters embedded in silica matrix

Cited by 28 publications

References 18 publications

Electrochemical supercapacitor performance of SnO2 quantum dots

Electrochemical supercapacitor performance of SnO2 quantum dots

Thermal Penetration of Gold Nanoparticles into Silicon Dioxide

Synthesis of Alloy Metal Nanoclusters in Silica Glass by Sequential Ion Implantation

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