Tuned linear optical properties of gold-polymer nanocomposites

Carotenuto, G.; Longo, Angela; Hison, C.

doi:10.1039/b905047g

Cited by 13 publications

(15 citation statements)

References 50 publications

(72 reference statements)

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“…The disappearance of the clear shoulders at 450 nm, which is a predictable absorption peak of the Cu 2 S phase, reveals the successful CuS nanoparticles’ fabrication [ 18 , 19 ]. The strong absorption in the range of visible wavelengths (690 to 1000 nm) can be attributed to the LSPR, which originates from the collective oscillation of the free conduction electrons in reply to the electromagnetic waves [ 20 ]. The local electromagnetic fields at the nanoparticle surface can be manipulated and enhanced due to the plasmon resonance [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Polymer Nanocomposites Based on [Methyl Cellulose](1−x):(CuS)x (0.02 M ≤ x ≤ 0.08 M) with Desired Optical Band Gaps

2017

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Abstract:In this paper, the sample preparation of polymer nanocomposites based on methyl cellulose (MC) with small optical bandgaps has been discussed. Copper monosulfide (CuS) nanoparticles have been synthesized from the sodium sulphide (Na 2 S) and copper chloride (CuCl 2 ) salts. Distinguishable localized surface resonance plasmon (LSRP) absorption peaks for CuS nanoparticles within the 680-1090 nm scanned wavelength range were observed for the samples. An absorption edge (E d ) was found to be widely shifted to a lower photon energy region. A linear relationship between the refractive index of the samples and the CuS fraction was utilized to describe the distribution of the particle. The optical bandgap of MC was reduced from 6.2 to 2.3 eV upon the incorporation of 0.08 M of CuS nanoparticles. The optical dielectric loss, as an alternative method, was used successfully to estimate the optical bandgap. Moreover, the electronic transition type was identified by using Tauc's extrapolation method. The plots of the optical dielectric constant and energy bandgap as a function of the CuS concentration were utilized to examine the validity of the Penn model. For the nanocomposite samples, the Urbach energy was found to be increased, which can be evidence for a large possible number of bands-to-tail and tail-to-tail transitions. However, from the X-ray diffraction (XRD) analysis, it was also found that the synthesized CuS nanoparticles disrupted the crystallinity phase of the MC polymer. Finally, fourier transform infrared (FTIR) spectroscopy for the samples was also performed. Significant decreases of transmittance intensity as well as band shifting in the FTIR spectra were observed for the doped samples.

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Section: Resultsmentioning

confidence: 99%

“…It is obvious that the LSPR peaks are broader rather than sharper. This could be due to the larger size distribution of the nanoparticles and their neighboring effects [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Polymer Nanocomposites Based on [Methyl Cellulose](1−x):(CuS)x (0.02 M ≤ x ≤ 0.08 M) with Desired Optical Band Gaps

2017

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“…Some substances such as PAMAM, 20,21 GSH, 22 BSA, 23 etc. 24,25 were usually used as stabilizing agents or templates in the preparation of Au NCs. Chitosan is a biodegradable material.…”

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confidence: 99%

“…Chitosan-stabilized Au NCs should be more suitable to use in biology compared with the other Au NCs. [20][21][22][23][24][25] For this reason, chitosan was used as a stabilizing agent here to prepare Au NCs. The chitosan-stabilized Au NCs were synthesized by heating the mixture of a HAuCl 4 aqueous solution and chitosan aqueous solution at the temperature of 90 C for 12 hours.…”

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confidence: 99%

Gold nanocluster-based light-controlled fluorescence molecular switch

et al. 2011

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“…Earlier studies emphased that the position of LSPR band can be manipulated through controlling the concentration, size, shape, and behavior of the metal nanoparticles as well as the dielectric behavior of the host materials [24,25]. It is interesting to notice that the broad LSPR peaks than the sharper ones can be due to the larger size distribution of the nanoparticles and their neighboring effects [24,26]. Among the wide variety of metal nanoparticles, considerable effort has been devoted in the synthesis controlling and the investigation of silver metal particles, because of their unique optical, electrical, and chemical properties [27].…”

Section: Uv-vis Studymentioning

confidence: 99%

<strong>From Nano Scale Silver Particles to Metallic Bulk Sizes: Increase of Silver Ion Reduction Rate in Chitosan:AgNO<sub>3</sub> Polymer electrolyte Mediated by Titanium Dioxide Filler</strong>

Aziz

Karim

Ghareeb

2018

Proceedings of 1st International Online Conference on Nanomaterials

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Synthesis of silver ion conducting polymer composites and its optical, electrical and morphological properties were conducted. In the study various amounts of titanium dioxide (TiO2) was added to the chitosan:silver nitrate (CS:AgNt) system. The appearance of SPR peak for CS:AgNt system and CS:AgNt doped with 1 wt.% TiO2 and disappearance of SPR peak for the system incorporated with 5 wt.% TiO2 reveals the formation of silver particle from nano scales to bulk metallic sizes. The optical microscope images reveal the formation of silver particles with bulk metallic sizes at 5 wt.% TiO2 filler. The SEM images show silver particles with small sizes for CS:AgNt and CS:AgNt incorporated with 1 wt.% TiO2. To make sure the reduction process of silver ions to metallic silver particles the impedance spectroscopy has been carried out. The decrease of dielectric constant and DC conductivity at high TiO2 concentration was correlated with the results of UV-vis and morphological achievments. Shifting of tanδ loss peak towards the lower frequency side at 5 wt.% TiO2 is an evident for the decrease in conductivity. The results of the present work reveals that silver ion conducting polymer electrolytes mediated by TiO2 filler are not suitable for electrochemical device application. Distinct peaks become visible in Mi spectra whereas no peaks can be seen in dielectric loss spectra.

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Tuned linear optical properties of gold-polymer nanocomposites

Cited by 13 publications

References 50 publications

Synthesis of Polymer Nanocomposites Based on [Methyl Cellulose](1−x):(CuS)x (0.02 M ≤ x ≤ 0.08 M) with Desired Optical Band Gaps

Synthesis of Polymer Nanocomposites Based on [Methyl Cellulose](1−x):(CuS)x (0.02 M ≤ x ≤ 0.08 M) with Desired Optical Band Gaps

Gold nanocluster-based light-controlled fluorescence molecular switch

<strong>From Nano Scale Silver Particles to Metallic Bulk Sizes: Increase of Silver Ion Reduction Rate in Chitosan:AgNO<sub>3</sub> Polymer electrolyte Mediated by Titanium Dioxide Filler</strong>

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