Tunable Electromagnetic Enhancement of Gold Nanoparticle Arrays

2017 ◽  
Vol 70 (8) ◽  
pp. 917
Author(s):  
Hailiang Huang ◽  
Guobin Yi ◽  
Xihong Zu ◽  
Benbin Zhong ◽  
Wenjing Lin ◽  
...  
Keyword(s):  
Particle Size ◽  
Electromagnetic Field ◽  
Gold Nanoparticle ◽  
Interparticle Distance ◽  
Field Enhancement ◽  
Au Nanoparticle ◽  
Average Particle ◽  
Nanoparticle Arrays ◽  
Spin Speed ◽  
Strong Electromagnetic Field

In this paper, triblock copolymer polyisoprene-block-polystyrene-block-poly(2-vinylpyridine) (PI-b-PS-b-P2VP) micelles containing HAuCl4 were spin-coated on silicon wafers followed by calcination to form gold nanoparticle arrays. Subsequently the surface optical performances of poly(3-hexylthiophene) (P3HT)-coated Au nanoparticle arrays were investigated. The particle size and the interparticle distance of the gold nanoparticle arrays could be controlled by adjusting the molar ratio of HAuCl4 precursor to vinyl pyridine units in PI-b-PS-b-P2VP and the spin speed during spin-coating. The results demonstrated that Au nanoparticle arrays with large nanoparticle size were able to produce strong electromagnetic field enhancement. Furthermore, the ratio of average particle size to average interparticle distance increased with decreasing spin speed, resulting in strong electromagnetic field enhancement for metal-enhanced fluorescence (MEF) and surface-enhanced Raman scattering (SERS).

Effects of particle size and annealing on plasmon-induced charge separation at self-assembled gold nanoparticle arrays

2018 ◽  
Vol 20 (5) ◽  
pp. 3735-3740 ◽  
Author(s):  
Kun-Che Kao ◽  
Hiroyasu Nishi ◽  
Tetsu Tatsuma
Keyword(s):  
Particle Size ◽  
Gold Nanoparticle ◽  
Quantum Efficiency ◽  
Charge Separation ◽  
Internal Quantum Efficiency ◽  
Au Nanoparticle ◽  
Nanoparticle Array ◽  
Nanoparticle Arrays ◽  
Induced Charge ◽  
Interface Mode

The internal quantum efficiency of plasmon-induced charge separation of a Au nanoparticle array on TiO2 without interparticle coupling increases with decreasing particle size. The efficiency is also improved by the enhancement of a plasmonic interface mode.

Highly efficient production of ordered wafer-scale gold nanoparticle arrays film by simple heat treatment based on colloidal monolayer

2018 ◽  
Vol 32 (15) ◽  
pp. 1850192 ◽  
Author(s):  
Junhuai Xiang ◽  
Chu Wang ◽  
Huilin Li ◽  
Dandan Men ◽  
Xiaofang Qiu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Colloidal Crystal ◽  
Red Shift ◽  
Au Nanoparticle ◽  
Localized Surface Plasmon ◽  
Efficient Production ◽  
Nanoparticle Arrays ◽  
Au Film ◽  
Colloidal Spheres

Periodic hexagonal gold crystal spherical nanoparticle arrays with controllable size and periodicity are fabricated by physical vapor deposition and further heat treatment based on monolayer colloidal crystal template. The size and center-to-center spacing of nanoparticles (NPs) were manipulated conveniently by tuning the deposition thickness of Au film and the size of colloidal spheres of the template, respectively. The thickness range of deposited Au film dependent on the size of colloidal spheres was investigated comprehensively. Dewetting model was established and employed to analyze the whole process of the evolution from gold film to spherical nanoparticle with uniform size. Additionally, localized surface plasmon resonance (LSPR) responses of these Au nanoparticle arrays were systematically measured. It is found that the extinction properties are significantly influenced by the particle size and periodicity of arrays. With the increase of particle size, the LSPR peak shows a red shift due to the quantum size effect of the nanoscaled Au particle. Meanwhile, the diffraction peaks also show small red shift due to a slight increase of average refractive index of arrays. This is highly helpful to improve its practical applications for detecting biochemical molecules based on LSPR and diffraction peak sensing.

scholarly journals Supramolecular Control over the Interparticle Distance in Gold Nanoparticle Arrays by Cyclodextrin Polyrotaxanes

Nanomaterials ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 168 ◽  
Author(s):  
Joao Paulo Coelho ◽  
José Osío Barcina ◽  
Elena Junquera ◽  
Emilio Aicart ◽  
Gloria Tardajos ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Interparticle Distance ◽  
Nanoparticle Arrays ◽  
Supramolecular Control

scholarly journals Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles

2019 ◽  
Author(s):  
István Rigó ◽  
Miklos Veres ◽  
László Himics ◽  
Zsuzsanna Pápa ◽  
Orsolya Hakkel ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electromagnetic Field ◽  
Gold Nanoparticle ◽  
Field Distribution ◽  
Time Domain ◽  
Near Field ◽  
Field Enhancement ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Giant plasmonic surface enhancement has been observed in gold coated micron sized inverse pyramids entrapping a gold nanoparticle. The amplification of both surface enhanced Raman and photoluminescence signals was found to be dependent on the diameter of trapped gold nanoparticle and around 50-fold enhancement was detected for 250nm diameter sample relatively to the 50nm one. Finite differential time domain simulations, performed to determine the near-field distribution in the structure, showed that when the nanoparticle protrudes into the hotspot zone of the void, coupling of electromagnetic field occurs and the plasmon-related near-field enhancement is concentrated into the close vicinity of the nanoparticle, mainly into the close gaps around the tangential points of the curved sphere and the flat pyramid surface. This results in a more than 15 times increase of the near-field intensity, compared to the empty void.

LASER INDUCED SURFACE PROCESSING WITH GOLD NANOPARTICLE ARRAYS EMBEDDED IN A TRANSPARENT MATRIX

NANO ◽  
2013 ◽  
Vol 08 (01) ◽  
pp. 1350003
Author(s):  
ALI ASGHAR ASKARI ◽  
ALI REZA BAHRAMPOUR
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Incident Light ◽  
Interparticle Distance ◽  
Silica Layer ◽  
Nanoparticle Arrays ◽  
Surface Processing ◽  
Light Fluence ◽  
High Efficient ◽  
532 Nm

Gold nanoparticles are widely used as high efficient photon–thermal energy converters in a broad range of applications. This paper presents a theoretical investigation on using the optothermal properties of gold nanoparticle arrays to generate nanoscale molten and rubbery regions on the surface of an amorphous polymeric film. Nanoparticles are assumed to be embedded in a transparent silica layer and illuminated with a 7.5 ns pulsed laser at 532 nm. Simulation results are presented for systems with single gold nanoparticles, dimers and chains. Both electromagnetic and thermal interaction between nanoparticles are found to be important factors in determining the result of surface processing. This effect allows us to control the shape and spatial characteristics of the phase transmitted regions with various parameters such as particles size, incident light fluence, polarization and direction, interparticle distance and chain length.

Dielectrophoretic Assembly of Gold Nanoparticle Arrays Evaluated in Terms of Room-Temperature Resistance

2020 ◽  
Vol E103.C (2) ◽  
pp. 62-65
Author(s):  
Yoshinao MIZUGAKI ◽  
Makoto MORIBAYASHI ◽  
Tomoki YAGAI ◽  
Masataka MORIYA ◽  
Hiroshi SHIMADA ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Room Temperature ◽  
Nanoparticle Arrays ◽  
Temperature Resistance
Sign in / Sign up

Export Citation Format

Share Document