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Separation of time-resolved phenomena in surface-enhanced Raman scattering of the photocatalytic reduction of p-nitrothiophenol.

van Schrojenstein Lantman EM, de Peinder P, Mank AJ, Weckhuysen BM - Chemphyschem (2014)

Bottom Line: We show that it is possible to study effects that occur on different time scales independently without data reduction using the photocatalytic reduction of p-nitrothiophenol as a showcase system.Using this approach a better description of the nanoscale reaction kinetics becomes available, while the short-term variations can be examined separately to examine reorientation and/or diffusion effects.Now such events can be easily separated from the bulk conversion process by making use of this chemometric method.

View Article: PubMed Central - PubMed

Affiliation: Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht (The Netherlands).

No MeSH data available.


Related in: MedlinePlus

One‐component PCA calculation of the full dataset. a) Loading of component 1 (56 % variance captured), b) score of component 1 in time, c) separation of spectra into the three categories, black and green spectra describe the bulk reaction, red spectra are spectral fluctuations and will be analysed separately later. d) Q‐residuals in time with 200 s filter. The datapoints are coloured as in (c).
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fig4: One‐component PCA calculation of the full dataset. a) Loading of component 1 (56 % variance captured), b) score of component 1 in time, c) separation of spectra into the three categories, black and green spectra describe the bulk reaction, red spectra are spectral fluctuations and will be analysed separately later. d) Q‐residuals in time with 200 s filter. The datapoints are coloured as in (c).

Mentions: A one‐component PCA on the time series (after spike removal) results in the component and score shown in Figure 4 a, b. The spectral pattern of the component shows great resemblance to the spectrum of DMAB, and describes 56 % of the variance in the dataset. The score plot of this component in time is similar to that expected for a reaction, with a slow increase in loading as time progresses. Hardly any short‐term fluctuations are visible.


Separation of time-resolved phenomena in surface-enhanced Raman scattering of the photocatalytic reduction of p-nitrothiophenol.

van Schrojenstein Lantman EM, de Peinder P, Mank AJ, Weckhuysen BM - Chemphyschem (2014)

One‐component PCA calculation of the full dataset. a) Loading of component 1 (56 % variance captured), b) score of component 1 in time, c) separation of spectra into the three categories, black and green spectra describe the bulk reaction, red spectra are spectral fluctuations and will be analysed separately later. d) Q‐residuals in time with 200 s filter. The datapoints are coloured as in (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4834609&req=5

fig4: One‐component PCA calculation of the full dataset. a) Loading of component 1 (56 % variance captured), b) score of component 1 in time, c) separation of spectra into the three categories, black and green spectra describe the bulk reaction, red spectra are spectral fluctuations and will be analysed separately later. d) Q‐residuals in time with 200 s filter. The datapoints are coloured as in (c).
Mentions: A one‐component PCA on the time series (after spike removal) results in the component and score shown in Figure 4 a, b. The spectral pattern of the component shows great resemblance to the spectrum of DMAB, and describes 56 % of the variance in the dataset. The score plot of this component in time is similar to that expected for a reaction, with a slow increase in loading as time progresses. Hardly any short‐term fluctuations are visible.

Bottom Line: We show that it is possible to study effects that occur on different time scales independently without data reduction using the photocatalytic reduction of p-nitrothiophenol as a showcase system.Using this approach a better description of the nanoscale reaction kinetics becomes available, while the short-term variations can be examined separately to examine reorientation and/or diffusion effects.Now such events can be easily separated from the bulk conversion process by making use of this chemometric method.

View Article: PubMed Central - PubMed

Affiliation: Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht (The Netherlands).

No MeSH data available.


Related in: MedlinePlus