Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Trans. Mat. Res. Soc. Japan

Naka

Matsumoto

et al. 2015

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Effects of silver nanoparticle (AgNP) and gold nanoparticle (AuNP) on photon upconversion based on sensitized triplet-triplet annihilation were examined in the system of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA). The ITO electrodes immobilized with AgNPs and AuNPs were prepared by electrophoretic method. Samples were prepared by sandwiching the solution of PtOEP and DPA between glass and the ITO electrode modified with AgNPs or AuNPs. In the sandwich samples, the enhancements of upconversion fluorescence from DPA were observed in the presence of AgNP, while the quenching of the upconversion fluorescence in the presence of AuNPs. The enhancements are most likely attributable to large electric fields due to localized surface plasmon resonance of AgNP. The quenching is most likely attributable to nonradiative metallic quenching of AuNP.

Section: Introductionmentioning

confidence: 99%

Effects of Silver and Gold Nanoparticles on Photon Upconversion Based on Sensitized Triplet-Triplet Annihilation

Trans. Mat. Res. Soc. Japan

Naka

Matsumoto

et al. 2015

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“…[17][18][19] In addition, MFEs have been powerful in verifying the mechanisms of photochemical reactions. We have clarified the mechanisms of photoelectrochemical reactions in photosensitive electrodes modified with D-A-linked compounds, [20][21][22] semiconductor nanoparticles, 23 C 60 nanoclusters, 24 and conductive polymers 25 by examining MFEs.…”

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confidence: 99%

“…The PUC measurement was conducted using a 532 nm continuous-wave laser as reported previously. 8 The MFE on upconverted fluorescence intensity was measured using an electromagnet in a similar manner to that described in previous papers [17][18][19][20][21][22][23][24][25] (ESI †).…”

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confidence: 99%

“…where I(0) and I(B) are the upconverted fluorescence intensities in the absence and presence of magnetic field B, respectively, similar to the examples in previous papers. [20][21][22][23][24][25] At low DPA concentration (1 mM) and low excitation power density (13.6 mW cm −2 ), the upconverted fluorescence intensity decreased in the presence of a magnetic field (Fig. S4, ESI †).…”

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confidence: 99%

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Switch of the magnetic field effect on photon upconversion based on sensitized triplet-triplet annihilation

Photochem Photobiol Sci

Naka

Nishino

et al. 2016

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“…Therefore, NMNPs have opened up the applications of LSPR. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] NMNPs have been utilized to improve the performance of photofunctional materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient generation of singlet oxygen due to localized surface plasmon resonance of silver nanoparticles in rose bengal–silver nanoparticle composite films

Motomura

2023

Jpn. J. Appl. Phys.

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Effect of silver nanoparticle (AgNP) on the generation of singlet oxygen (1O2*) using a rose bengal (RB) as a photosensitizer for photodynamic therapy (PDT) were examined by measuring the phosphorescence spectra of 1O2* from RB-AgNP composite film and RB film on glass plates in CCl4. 1O2* was successfully detected by direct observation of the characteristic 1O2* phosphorescence around 1275 nm in two films. The excitation spectra of 1O2* in two films were in agreement with the absorption spectrum of RB in RB film or in acetone solution. The results indicates that the generation of 1O2* is ascribed by the PDT type Ⅱ reaction. The phosphorescence intensity of 1O2* in RB-AgNP composite film was larger than that in RB film. The enhancement of the phosphorescence intensity of 1O2* is most likely attributable to large electric fields due to localized surface plasmon resonance of AgNP aggregates.