Monitoring the reactivity of Ag nanoparticles for different atmospheres by using in situ and real-time optical spectroscopy

2011 ◽  
Author(s):  
V. Antad ◽  
L. Simonot ◽  
D. Babonneau ◽  
S. Camelio ◽  
F. Pailloux ◽  
...  
Keyword(s):  
Real Time ◽  
Optical Spectroscopy ◽  
Ag Nanoparticles

Photoinduced synthesis of Ag nanoparticles on ZnO nanowires for real-time SERS systems

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Hyun Wook Kang ◽  
Juyoung Leem ◽  
Hyung Jin Sung
Keyword(s):  
Real Time ◽  
Ag Nanoparticles ◽  
Enhancement Factor ◽  
Detection System ◽  
Microfluidic Channel ◽  
Zno Nanowires ◽  
Hierarchical Nanostructure ◽  
Sers Detection ◽  
Photoinduced Synthesis

Hierarchical nanostructure of Ag nanoparticles on ZnO nanowires is introduced by using a photoinduced synthesis. A real-time, in situ SERS detection system is achieved with a microfluidic channel. The hierarchical nanostructure shows 6.36 × 1011 of SERS enhancement factor.

scholarly journals Direct observation of the CVD growth of monolayer MoS2 using in situ optical spectroscopy

2019 ◽  
Vol 10 ◽  
pp. 557-564 ◽  
Author(s):  
Claudia Beatriz López-Posadas ◽  
Yaxu Wei ◽  
Wanfu Shen ◽  
Daniel Kahr ◽  
Michael Hohage ◽  
...  
Keyword(s):  
Real Time ◽  
Optical Spectroscopy ◽  
Chemical Vapor ◽  
Semiconductor Materials ◽  
Transition Metal Dichalcogenide ◽  
Monolayer Mos2 ◽  
In Situ Study ◽  
Sapphire Substrates ◽  
Cvd Growth

Real-time monitoring is essential for understanding and precisely controlling of growth of two-dimensional transition metal dichalcogenide (2D TMDC) materials. However, it is very challenging to carry out such studies during chemical vapor deposition (CVD). Here, we report the first, real time, in situ study of the CVD growth of 2D TMDCs. More specifically, the CVD growth of a molybdenum disulfide (MoS2) monolayer on sapphire substrates has been monitored in situ using differential transmittance spectroscopy (DTS). The growth of the MoS2 monolayer can be precisely followed by observation of the evolution of the characteristic optical features. Consequently, a strong correlation between the growth rate of the MoS2 monolayer and the temperature distribution in the CVD reactor has been revealed. Our results demonstrate the great potential of real time, in situ optical spectroscopy to assist the precisely controlled growth of 2D semiconductor materials.

Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

2018 ◽  
Author(s):  
Elaine A. Kelly ◽  
Judith E. Houston ◽  
Rachel Evans
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Wormlike Micelles ◽  
Tetraethylene Glycol ◽  
Light Illumination ◽  
First Time ◽  
Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such as<i></i>drug delivery and micellar catalysis. Currently, their behaviour in the equilibrium <i>cis-</i>and <i>trans</i>-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>) using small-angle neutron scattering (SANS). We show that the incorporation of <i>in-situ</i>UV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>could switch between wormlike micelles (<i>trans</i>native state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked <i>in</i><i>-situ</i>through combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

Flat Flexible Thin Milli-electrode Array for Real-time in situ Water Quality Monitoring in Distribution Systems

2017 ◽  
Vol 2017 (4) ◽  
pp. 5598-5617
Author(s):  
Zhiheng Xu ◽  
Wangchi Zhou ◽  
Qiuchen Dong ◽  
Yan Li ◽  
Dingyi Cai ◽  
...  
Keyword(s):  
Water Quality ◽  
Real Time ◽  
Distribution Systems ◽  
Electrode Array ◽  
Water Quality Monitoring ◽  
Quality Monitoring
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