Pinpointing Photothermal Contribution in Photochemical Reaction on Plasmonic Gold Nanoparticles

2022 ◽  
Author(s):  
Hao Wang ◽  
Zheng Cao ◽  
Liqin Zheng ◽  
Xian Wang ◽  
Mengke Su ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Laser Heating ◽  
Conversion Rate ◽  
Photochemical Reaction ◽  
Reaction Rate ◽  
Heating Effect

Dimerization of PNTP to DMAB could be directly driven by the laser heating effect. In plasmonic photocatalysis, the conversion rate and the reaction rate highly depended on the GNP sizes....

Gold nanoparticles-coated chemically-reactive polymer colloids and the study of their catalytic kinetics

2014 ◽  
Vol 1641 ◽  
Author(s):  
Maolin Li ◽  
Vivian Zhong ◽  
Guofang Chen
Keyword(s):  
Gold Nanoparticles ◽  
Reaction Time ◽  
Rate Constant ◽  
Apparent Rate Constant ◽  
Reaction Rate ◽  
Catalytic Efficiency ◽  
Reduction Reaction ◽  
Assembly Method ◽  
Nitrophenol Reduction ◽  
Time Average

ABSTRACTRaspberry-like composite spheres based on chemically-reactive poly(glycidyl methacrylate) (PGMA) colloids as the cores coated with tunable size of gold nanoparticles were synthesized via a controlled assembly method. Kinetic study of 4-nitrophenol reduction by NaBH4 in the presence of poly(allylamine hydrochloride)-modified PGMA composite with tunable size of AuNPs (PGMA@PAH@AuNPs) was demonstrated. Effects of gold nanoparticles size and PGMA colloid diameter on the reaction time, average reaction rate and average turnover frequency (TOF), order of reaction (n) and apparent rate constant (kapp) were systematically investigated. Experimental results of our study showed composites with 3.4 ± 0.9 nm AuNPs have the best catalytic efficiency with the highest reaction order and apparent rate constant. The poisoning of product 4-aminophenol on PAH-modified PGMA colloid-supported gold nanocatalysts was evaluated using 4-nitrophenol/NaBH4 reduction reaction for the reaction time, average reaction rate, average TOF, order of reaction and apparent rate constant.

Upconversion Luminescence, Laser Heating Effect and Temperature Sensing Properties of β-BiNbO4:Er3+/Yb3+

2020 ◽  
Vol 50 (1) ◽  
pp. 201-208
Author(s):  
Yongqiang Wang ◽  
Xingbang Dong ◽  
Huanjun Zhang ◽  
Xiaobo Deng ◽  
Xuerui Cheng
Keyword(s):  
Laser Heating ◽  
Upconversion Luminescence ◽  
Temperature Sensing ◽  
Heating Effect ◽  
Sensing Properties

Laser-Heating Effect on Raman Spectra of Individual Suspended Single-Walled Carbon Nanotubes

2007 ◽  
Vol 111 (5) ◽  
pp. 1988-1992 ◽  
Author(s):  
Yingying Zhang ◽  
Hyungbin Son ◽  
Jin Zhang ◽  
Jing Kong ◽  
Zhongfan Liu
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectra ◽  
Laser Heating ◽  
Single Walled Carbon Nanotubes ◽  
Heating Effect ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Photoluminescence Investigation Based on Laser Heating Effect in ZnO-Ordered Nanostructures

2006 ◽  
Vol 110 (2) ◽  
pp. 846-852 ◽  
Author(s):  
Yingling Yang ◽  
Hongwei Yan ◽  
Zhengping Fu ◽  
Beifang Yang ◽  
Linsheng Xia ◽  
...  
Keyword(s):  
Laser Heating ◽  
Heating Effect ◽  
Ordered Nanostructures

Structural reasons for the formation of multicomponent products and the influence of high pressure

2021 ◽  
Vol 77 (3) ◽  
Author(s):  
Krzysztof A. Konieczny ◽  
Julia Bąkowicz ◽  
Damian Paliwoda ◽  
Mark R. Warren ◽  
Arkadiusz Ciesielski ◽  
...  
Keyword(s):  
High Pressure ◽  
Photochemical Reaction ◽  
Unit Cell Volume ◽  
Reaction Rate ◽  
Crystalline Form ◽  
Reaction Centre ◽  
High Elasticity ◽  
Reaction Proceeds ◽  
Kinetics Of

(S)-(−)-1-Phenylethanaminium 4-(2,4,6-triisopropylbenzoyl)benzoate (S-PEATPBB) undergoes a photochemical reaction in its crystalline form upon UV irradiation and forms three different products: the first product is the result of a Yang cyclization with the participation of the δ-H atom of o-isopropyl (product D) and the second and third products are obtained via a Norrish–Yang reaction with the involvement of the γ-H atom of 2-isopropyl (product P) and 6-isopropyl (product Z). These products are formed in different proportions (D > P >> Z). The path and kinetics of the reaction were monitored step-by-step using crystallographic methods, both under ambient and high-pressure conditions. The reactivity of S-PEATPBB depends strongly on the geometry of the reaction centre and the volume of the reaction cavity. Due to the geometrical preferences making the cyclization reaction easier to proceed, product D dominates over the other products, while the formation of product Z becomes difficult or almost impossible at high pressure. The reaction proceeds with an increase of the unit-cell volume, which, suppressed by high pressure, results in a significant decrease of the reaction rate. The crystal lattice of S-PEATPBB shows high elasticity. The quality of the partially reacted crystal remains the same after decompression from 0.75 GPa to 0.1 MPa.

Raman Band Redshifting of α-Cu2(OH)3Cl with Decreasing the Temperature

2012 ◽  
Vol 430-432 ◽  
pp. 391-394
Author(s):  
Xiao Dong Liu ◽  
Xing Liang Xu ◽  
Dong Dong Meng ◽  
Masayoshi Fujihala ◽  
Xu Guang Zheng ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Laser Heating ◽  
Raman Band ◽  
Negative Thermal Expansion ◽  
Polycrystalline Sample ◽  
Heating Effect ◽  
Lattice Thermal Expansion ◽  
Geometric Frustration ◽  
Thermal Expansion Effect ◽  
Expansion Effect

Raman spectra of the magnetic geometric frustration material – the botallackite-structure α-Cu2(OH)3Cl polycrystalline sample were measured down to liquid N2 temperature. It is found that the hydroxyl stretching bands shift abnormally according to the lattice thermal expansion effect of normal materials, i.e., they redshift with decreasing the sample temperature (negative thermal expansion) using liquid N2 cooling while other bands blueshift. This abnormality was also confirmed by observing the band-shifting caused by local laser heating effect using different laser powers, and can be qualitatively explained by checking the local hydroxyl environment with a trimeric hydrogen bond.

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