Optical and photoluminescence studies of gold nanoparticles embedded ZnO thin films

Patra, Anuradha; Das, V. Damodara; Kasiviswanathan, S.

doi:10.1016/j.tsf.2009.09.019

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…In Patra et al's experiment, gold nanoparticles embedded ZnO thin films also shows this red-shift. 37 Then we discuss the gold-protein core-shell nanostructure thin films with the total particle volume fraction Q = 0 1 and the dielectric constants 2 = 2 3 = 1 7. The effect of the protein shell thickness is shown in Figure 3(a).…”

Section: Resultsmentioning

confidence: 99%

Shell Thickness Dependent Non-Monotonic Plasmon Shift of Gold-Protein Core–Shell Nanoparticle Thin Films

Yuan¹,

Jian²,

Li³

et al. 2011

Jnl of Comp & Theo Nano

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Based on Maxwell-Garnett effective medium theory, the surface plasmon resonance (SPR) absorption of gold-protein core-shell nanostructure embedded thin films is analyzed as a function of protein shell thickness and core volume fraction in total particle. The increases of both shell thickness and volume fraction create the red shift of SPR. When the shell thickness and the core volume fraction take effect at the same time, there is a competition. When the gold core radius is a fixed value and the total particle radius increases, in other words, the shell thickness increases but the core volume fraction decreases, the absorption peak blue shifts firstly and then red shifts. That means the core volume fraction plays the major role for thinner shell. Whereas when the shell is thick, the shell thickness plays the major role. There is linearity between the core radius and the total radius in determining the critical point of the plasmon shift. By this linear relation, we can control the shift direction of the SPR absorption. This work shows a potential bio-sensing method based on detecting the shift direction of the SPR absorption.

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Section: Resultsmentioning

confidence: 99%

Shell Thickness Dependent Non-Monotonic Plasmon Shift of Gold-Protein Core–Shell Nanoparticle Thin Films

Yuan¹,

Jian²,

Li³

et al. 2011

Jnl of Comp & Theo Nano

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“…Samples were formed on GP and Si substrates for optical and SEM studies, respectively. Details of the fabrication of the samples can be found elsewhere [20]. Briefly, a thin film of ZnO was first deposited on GP and Si substrates by pulsed dc magnetron sputtering of pure Zn target in Ar O 2 plasma (O 2 ∶Ar is 99∶1) at a pressure of 4 × 10 −1 Pa.…”

Section: Methodsmentioning

confidence: 99%

Spectral response of nanocrystalline ZnO films embedded with Au nanoparticles

2012

Self Cite

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The optical response of a two-phase composite consisting of Au nanoparticles (AuNPs) in a nanocrystalline ZnO thin film matrix has been systematically studied and analyzed by the Bergman-Milton spectral density formalism. The real and imaginary parts of the effective dielectric function exhibited anomalous dispersion and absorption, respectively, at the characteristic localized surface plasmon resonance (LSPR) wavelength. A multilayer structure consisting of two AuNP-ZnO composite films separated by a thin ZnO film displayed a twofold increase in the absorption at LSPR (with negligible change in FWHM), which is attributed to the increase in the number density of the AuNPs resulting from the nanocrystalline nature of the ZnO film. The results have been used to correlate the spectral density function to the morphology of AuNPs in a ZnO matrix.

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“…The value of ZnO-AuNP is recorded higher than TiO-AuNP since ZnO-AuNP has faster electron movement and better biocompatibility compared with TiO2 [14]. This material is well known for the best chemistry causing the high conductivity than others [24]. The second highest is TiO2-AuNP where the difference in the value of immobilization is little but instead shows a huge gap in the hybridization process.…”

Section: Electrical Performance On Device and Dna Complementationmentioning

confidence: 97%

“…Both ZnO and TiO2 are favourite materials in sensing application due to a good electrical transfer and enhancement of AuNP makes the electrical conductivity faster. The presence of AuNPs on both metal oxides, ZnO and TiO2 is to give a higher conductivity since AuNP has high biocompatibility on IDE [25]. The bare graph supposed to have the lowest current reading because of the non-existence of active materials on top of active area which indicates there is a very low electric flow occurred.…”

Section: Electrical Performance On Device and Dna Complementationmentioning

confidence: 99%

Distinct Detection of Ganoderma Boninense On Metal Oxides-Gold Nanoparticle Composite Deposited Interdigitated Electrode DNA sensor

Thivina

Hashim

Gopinath

et al. 2021

J. Phys.: Conf. Ser.

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Oil palms suffer severe losses due to Ganoderma boninense infection that causes Basal Stem Rot (BSR). The available detection measuring the severity of BSR disease have not proved satisfactory output. Due to the influence of oil palm industry in country’s economy, effective and efficient means of diagnostic measure is mandatory. Among the available diagnostic tools, biosensors were redeemed to yield the most rapid and selective results. To overcome the current issues, herein Interdigitated Electrode (IDE) electrochemical DNA biosensor to detect Ganoderma boninense was successfully designed and fabricated by thermal deposition. Lift-off photolithography fabrication process was applied followed by the surface chemical functionalization via seed deposition. Zinc Oxide (ZnO) and Titanium Dioxide (TiO2) were overlaid and the functionalized metal oxides IDE surfaces were used to detect DNA sequence complementation from Ganoderma boninense. Furthermore, gold nanoparticles were doped to increase the surface to volume ratio and enhance biocompatibility. Characterizations were made by validating the sensor’s topology characteristics and electrical characteristics. From the results recorded, it has been justified that IDE with ZnO doped with gold nanoparticles surface serves as an excellent DNA sensor for the detection of Ganoderma boninense with a remarkable current of 290 nA and 176 nA for immobilization and hybridization respectively.

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Optical and photoluminescence studies of gold nanoparticles embedded ZnO thin films

Cited by 14 publications

References 12 publications

Shell Thickness Dependent Non-Monotonic Plasmon Shift of Gold-Protein Core–Shell Nanoparticle Thin Films

Shell Thickness Dependent Non-Monotonic Plasmon Shift of Gold-Protein Core–Shell Nanoparticle Thin Films

Spectral response of nanocrystalline ZnO films embedded with Au nanoparticles

Distinct Detection of Ganoderma Boninense On Metal Oxides-Gold Nanoparticle Composite Deposited Interdigitated Electrode DNA sensor

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