Effect of annealing on the surface plasmon resonance of dodecanethiol encapsulated gold nanoparticles Langmuir–Schafer thin films

Abbas, Rajaa R.; Richardson, T.; Hobson, Adam; Hassan, Aseel; Abbas, Talib R.

doi:10.1016/j.colsurfa.2013.12.036

Cited by 7 publications

(5 citation statements)

References 38 publications

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“…With further squeezing barriers, we observe a collapse of the monolayer at the surface pressure of ≈17 mN/m (SA ≈ 225 cm 2 ) which is consistent with previous studies. [ 47,48 ] Similarly, we identify the collapse point from absorption spectra of the Langmuir AuNPs monolayer measured in situ at different subphase area and pressure as shown in Figure 1b The absorption band centered at ≈530 nm corresponds to localized surface plasmon (LSP) resonance in gold nanoparticles. Our spectral analysis indicates linear dependence of optical density on the SA above 190 cm 2 .…”

Section: Resultsmentioning

confidence: 99%

Resonant Plasmon‐Enhanced Absorption of Charge Transfer Complexes in a Metal–Organic Monolayer

Krichevsky

Tolbin

Dubinina

et al. 2021

Advanced Optical Materials

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Plasmonic enhancement of absorption in charge‐transfer (CT) complexes formed under NO2 gas adsorption onto 2D hybrid structure, based on the metal–organic monolayer and gold nanoparticles (AuNPs), is demonstrated. By using Langmuir–Blodgett deposition of low‐symmetry zinc phthalocyanine (ZnPc) molecules, the metal–organic monolayer is fabricated with greatly suppressed intermolecular aggregation. Oxidation of the monolayer through coordination of NO2 molecules with axial zinc ions of ZnPc molecules gives rise to the specific absorption band inherited to cation radical ZnPc+. The hybrid AuNPs–ZnPc structure is engineered to maximize exciton–plasmon interaction of CT complexes at the radical form of the metal–organic monolayer. Excellent spectral and spatial overlaps with plasmon resonance boost absorption of CT internal optical transition, so‐called “fingerprint” band, by a factor of six from 0.45% to 2.8% in total. The approach paves the way for efficient plasmonic control over photochemical reactions promoted by charge‐transfer complexes in metal–organic films. In particular, the plasmonic effect is harnessed to improve NO2 gas sensing properties; the experimental study shows a 15‐fold increase of the detection efficiency in the specific band of CT complexes under the gas exposure.

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Section: Resultsmentioning

confidence: 99%

Resonant Plasmon‐Enhanced Absorption of Charge Transfer Complexes in a Metal–Organic Monolayer

Krichevsky

Tolbin

Dubinina

et al. 2021

Advanced Optical Materials

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“…Also, because of the higher charge densities on the larger nanoparticle, the intensity of LSPR increases. When two nanoparticles are placed next to each other closer than a distance equal or smaller than 2.5 times of the particle diameter, interparticle near field coupling occurs [4,17,47]. Oppositely, the particle behaves as a single-particle dipole mode.…”

Section: Resultsmentioning

confidence: 99%

“…As the oscillation frequency of the electrons weakens, the resonance frequency decreases, and the resonance energy increases. Thus, the position of the LSPR peak shifts toward the NIR region [2,5,12,47,48,[51][52][53].…”

Section: Resultsmentioning

confidence: 99%

Effect of Ar Gas Pressure on LSPR Property of Au Nanoparticles: Comparison of Experimental and Theoretical Studies

et al. 2020

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In this study, the thin films were produced by using pulsed laser deposition (PLD) technique from gold (Au) nanoparticles deposited on two kinds of substrates under different argon (Ar) gas pressure. Microscope glass slides and silicon (100) wafers were used as amorphous and crystal substrates. The films were deposited under 2 × 10−3 mbar, 1 × 10−2 mbar, 2 × 10−2 mbar argon (Ar) ambient gas pressure. Effect of the background gas pressure on the plasma plume of the ablated Au nanoparticles was investigated in details. Morphology of Au nanoparticle thin films was investigated by means of atomic force microscopy (AFM) technique. Absorption spectra of Au nanoparticles were examined by using UV-Vis spectrometry. Extinction spectra of Au nanoparticles were calculated by using metallic nano particles boundary element method (MNPBEM) simulation programme. Both experimental spectra and simulation data for Au nanoparticles were obtained and compared in this work. It was concluded that they are also in good agreement with literature data. The measurements and the simulation results showed that localized surface plasmon resonance (LSPR) peaks for Au nanoparticles were located in the near infrared region (NIR) because of the larger size of the disk-like shape of Au nanoparticles, and the near-field coupling between Au nanoparticles. It was demonstrated that as the ambient gas (Ar) pressure was increased, the size and the density of Au nanoparticles on the substrate were decreased and the LSPR peak shifts toward the short wavelength region in the spectrum. This shift has been explained by the changes in the morphology of produced thin films.

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“…Commercial dodecanethiol (CH 3 (CH 2 ) 11 SH)-encapsulated gold nanoparticles (AuNPs) with 2 nm particle size (purchased from PlasmaChem GmbH, Germany) [25] and calix [4]arene-17C were used in this work. The chemical structures of the AuNPs and calixarene molecules can be found elsewhere [26,27]. Hexamethyldisilazane (HMDS) was purchased from Sigma-Aldrich, while chloroform (CHCl 3 ) and isopropanol (IPA) were obtained from Fisher Scientific.…”

Section: Methodsmentioning

confidence: 99%

“…As a first step for the fabrication of LS thin films of the AuNPs and the calixarene molecules, pressure-area ( -A) isotherm graphs have been recorded to determine the appropriate deposition surface pressure values of the monolayers. The -A isotherm graphs of the AuNPs molecules can be found from our previous publication [26]. All monolayers with different volumes of solution spread onto the water surface form stable monolayers at the air-water interface.…”

Section: Films' Fabrication and Characterizationmentioning

confidence: 99%

Fabrication, characterization and gas sensing properties of gold nanoparticle and calixarene multilayers

2017

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Calixarenes are a group of materials that are widely used for gas sensing studies because of their simple synthesis, conformational flexibility, binding group tunability, variability in their cavity sizes and improved selectivity to different gas molecules. In recent years it has been shown that incorporation of gold nanoparticles (AuNPs) into organic layers further enhances their gas sensing performance. The present study reports on the fabrication of thin films of calixarene and AuNPs using Langmuir-Schaefer (LS) methods. The gas sensing properties of the produced films are investigated on exposure to saturated vapours of volatile organic compounds (VOCs) using surface plasmon resonance as an optical detection technique. Multilayers comprising films of AuNPs and calixarene have been investigated to evaluate the effect of AuNPs on the films sensing performances. It has been demonstrated that the hybrid layers exhibited improved sensing performance in terms of the degree of their response.

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Effect of annealing on the surface plasmon resonance of dodecanethiol encapsulated gold nanoparticles Langmuir–Schafer thin films

Cited by 7 publications

References 38 publications

Resonant Plasmon‐Enhanced Absorption of Charge Transfer Complexes in a Metal–Organic Monolayer

Resonant Plasmon‐Enhanced Absorption of Charge Transfer Complexes in a Metal–Organic Monolayer

Effect of Ar Gas Pressure on LSPR Property of Au Nanoparticles: Comparison of Experimental and Theoretical Studies

Fabrication, characterization and gas sensing properties of gold nanoparticle and calixarene multilayers

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