Modulation of the Photophysical Properties of Gold Nanoparticles by Accurate Control of the Surface Coverage

Langmuir ◽  
2004 ◽  
Vol 20 (18) ◽  
pp. 7884-7886 ◽  
Author(s):  
Marco Montalti ◽  
Luca Prodi ◽  
Nelsi Zaccheroni ◽  
Gionata Battistini
Keyword(s):  
Gold Nanoparticles ◽  
Surface Coverage ◽  
Photophysical Properties

scholarly journals PYRENE EMISSION FROM MONOLAYERS "CLICKED" ONTO QUARTZ

2013 ◽  
Vol 01 (01) ◽  
pp. 1250007
Author(s):  
HONGYAN SONG ◽  
SERGEY GORELIK ◽  
JONATHAN HOBLEY ◽  
JIEXUN LI ◽  
AÏCHA BOUDHAR ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Coverage ◽  
Charge Transfer Band ◽  
Photophysical Properties ◽  
High Surface ◽  
Excimer Emission ◽  
Excitation Spectra ◽  
Visible Absorption ◽  
Molecular Monolayers ◽  
A Charge

A series of quartz surfaces were modified with a series of crosslinkers and functional groups in order to obtain an azide-terminated monolayer, which was then used to immobilize pyrene onto the surface via alkyne-azide "click" chemistry. During the course of the immobilization, different ratios of tert-butyl diphenyl chlorosilane were used to control the distribution and hence the photophysical properties of the pyrene on the surface. The preparative surface reactions and photophysical properties were investigated with contact angle, X-ray photoelectron spectroscopy, UV-visible absorption and emission spectroscopy. High surface coverage was achieved of just under 1molecule per nm2. At this coverage all emission from the pyrene was in the form of excimer emission. Excimer emission dominated at all surface coverages greater than 0.45 molecules per nm2. Below this coverage the monomer emission could also be observed. The conclusions that can be drawn are important for understanding the interactions of neighboring molecules in molecular monolayers. Our results suggest that at high surface coverage a substantial number of the pyrene molecules are already close enough to their neighbors that pairs of them can be directly excited to form excimer with no requirement for diffusion. This can be stated because the long wavelength end of the pyrene absorption and excitation spectra show a broad tail that is assigned to a charge transfer band resulting from an electron being directly transferred from a ground state pyrene to a neighboring pyrene molecule. Furthermore, absorption spectra shifts also indicate that the pyrene molecules undergo some interactions on the surface when they are closely packed.

Improved hole injection in organic light emitting devices by gold nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 684-689 ◽  
Author(s):  
P. Justin Jesuraj ◽  
K. Jeganathan
Keyword(s):  
Gold Nanoparticles ◽  
Surface Coverage ◽  
Hole Injection ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

AuNPs at various surface coverage.

scholarly journals Preparation of porous polymer monoliths featuring enhanced surface coverage with gold nanoparticles

2012 ◽  
Vol 1261 ◽  
pp. 121-128 ◽  
Author(s):  
Yongqin Lv ◽  
Fernando Maya Alejandro ◽  
Jean M.J. Fréchet ◽  
Frantisek Svec
Keyword(s):  
Gold Nanoparticles ◽  
Surface Coverage ◽  
Porous Polymer ◽  
Polymer Monoliths ◽  
Enhanced Surface

scholarly journals Controllable Synthesis and Catalytic Performance of Gold Nanoparticles with Cucurbit[n]urils (n = 5–8)

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1015 ◽  
Author(s):  
Liangfeng Zhang ◽  
Simin Liu ◽  
Yuhua Wang ◽  
Haijun Zhang ◽  
Feng Liang
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Direct Relationship ◽  
Surface Coverage ◽  
Catalytic Performance ◽  
Ring Size ◽  
Controllable Synthesis ◽  
New Applications ◽  
Nanoparticle Sizes

A series of gold nanoparticles (AuNPs) was prepared in situ with different cucurbit[n]urils (CB[n]s) in an alkaline aqueous solution. The nanoparticle sizes can be well controlled by CB[n]s (n = 5, 6, 7, 8) with different ring sizes. The packing densities of CB[5–8] and free surface area on AuNPs were determined. A direct relationship was found between the ring size and packing density of CB[n]s with respect to the AuNP-catalyzed reduction of 4-nitrophenol in the presence of NaBH4. The larger particle size and higher surface coverage of bigger CB[n]-capped AuNPs significantly decreased the catalytic activity. Furthermore, this work could lead to new applications that utilize AuNPs under an overlayer of CB[n]s for catalysis, sensing, and drug delivery.

scholarly journals Volcano-shape glycerol oxidation activity of palladium-decorated gold nanoparticles

2014 ◽  
Vol 5 (10) ◽  
pp. 3715-3728 ◽  
Author(s):  
Zhun Zhao ◽  
Joni Arentz ◽  
Lori A. Pretzer ◽  
Pongsak Limpornpipat ◽  
James M. Clomburg ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Bimetallic Catalysts ◽  
Surface Coverage ◽  
Glycerol Oxidation ◽  
Oxidation Activity

Activity and selectivity of glycerol oxidation were highly dependent upon Pd surface coverage of Pd-on-Au bimetallic catalysts.

Effect of caffeic acid adsorption in controlling the morphology of gold nanoparticles: role of surface coverage and functional groups

2016 ◽  
Vol 18 (40) ◽  
pp. 27775-27783 ◽  
Author(s):  
Kyeounghak Kim ◽  
Jeong Woo Han
Keyword(s):  
Gold Nanoparticles ◽  
Caffeic Acid ◽  
Functional Groups ◽  
Surface Coverage

The morphology of gold nanoparticles can be effectively controlled by tailoring the adsorption coverages, deprotonated forms, and functional groups of caffeic acid.

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