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.

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).

scholarly journals Electrochemical modulation of plasmon-induced charge separation behaviour at Au–TiO2 photocathodes

2019 ◽  
Vol 18 (7) ◽  
pp. 1727-1731 ◽  
Author(s):  
Kazutaka Akiyoshi ◽  
Tetsu Tatsuma
Keyword(s):  
Particle Size ◽  
Charge Separation ◽  
Enhancement Factor ◽  
Induced Charge

Photocathodic currents of ITO/Au/TiO2 electrodes based on plasmon-induced charge separation were enhanced by applying negative potentials, and the enhancement factor was increased as the particle size was decreased.

Why ultrafast charge separation occurs in bulk-heterojunction organic solar cells: a multichain tight binding model study

2021 ◽  
Author(s):  
Yujuan Huang ◽  
Longlong Zhang ◽  
Yuying Hao
Keyword(s):  
Solar Cells ◽  
Quantum Efficiency ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Bulk Heterojunction ◽  
Internal Quantum Efficiency ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Binding Model ◽  
Model Study

Bulk-heterojunction (BHJ) organic solar cells (OSCs) exhibit the ultrafast charge separation (UCS) ability, enables lowering the geminate charge recombination and achieving the high internal quantum efficiency. Unravelling why UCS occurs...

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.

Plasmon-Induced Charge Separation and Recombination Dynamics in Gold−TiO2 Nanoparticle Systems: Dependence on TiO2 Particle Size

2009 ◽  
Vol 113 (16) ◽  
pp. 6454-6462 ◽  
Author(s):  
Luchao Du ◽  
Akihiro Furube ◽  
Kazuhiro Yamamoto ◽  
Kohjiro Hara ◽  
Ryuzi Katoh ◽  
...  
Keyword(s):  
Particle Size ◽  
Charge Separation ◽  
Tio2 Particle ◽  
Tio2 Nanoparticle ◽  
Induced Charge ◽  
Recombination Dynamics

The lowest-energy charge-transfer state and its role in charge separation in organic photovoltaics

2016 ◽  
Vol 18 (26) ◽  
pp. 17546-17556 ◽  
Author(s):  
Guangjun Nan ◽  
Xu Zhang ◽  
Gang Lu
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
Charge Separation ◽  
Driving Force ◽  
Internal Quantum Efficiency ◽  
Energy Charge ◽  
Charge Transfer State ◽  
Dynamic Disorder ◽  
Configuration Entropy ◽  
Transfer State

The localized charge transfer state can lead to >90% internal quantum efficiency provided by the driving force from dynamic disorder and configuration entropy.

Gold nanoparticle array formation on dimpled Ta templates using pulsed laser-induced thin film dewetting

2015 ◽  
Vol 17 (16) ◽  
pp. 11062-11069 ◽  
Author(s):  
Hany A. El-Sayed ◽  
Corie A. Horwood ◽  
Ebenezer Owusu-Ansah ◽  
Yujun J. Shi ◽  
Viola I. Birss
Keyword(s):  
Thin Film ◽  
Gold Nanoparticle ◽  
Pulsed Laser ◽  
Au Nanoparticle ◽  
Nanoparticle Array

Au nanoparticle array formed on a dimpled Ta template using laser-induced thin film dewetting.

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
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