Details
| Original language | English |
|---|---|
| Pages (from-to) | 175-186 |
| Number of pages | 12 |
| Journal | CHEMELECTROCHEM |
| Volume | 5 |
| Issue number | 1 |
| Early online date | 16 Oct 2017 |
| Publication status | Published - 2 Jan 2018 |
Abstract
The interfacial transfer of charge carriers across the semiconductor nanoparticle/electrolyte boundary is an elementary process for applications such as photoelectrochemical sensing and photocatalysis. This mechanism is investigated for systems based on complex shaped semiconductor and metal-semiconductor nano-heteroparticles. In the present work the influence of the presence of a CdSe domain within the CdS nanorod as well as the influence of gold domain decoration is investigated spectroelectrochemically. Therefore, the mentioned nanoparticles are linked to transparent indium tin oxide (ITO) glass slides via (3-mercaptopropyl)trimethoxysilane (MPTMS). This preparation yields sub-monolayers of the particles. External photocurrent quantum efficiency spectra are measured in the range from λ=350–650 nm. Intensity-modulated photocurrent spectroscopy (IMPS) and electrochemical impedance spectroscopy (EIS) measurements are applied to the samples in order to reveal and explain the differences of the electrochemical kinetics between the four different particle types (CdS, CdSe/CdS, CdS−Au, and CdSe/CdS−Au nanorods). We demonstrate that the presence of gold domains affects the carrier dynamics of various involved processes. An equivalent circuit model is derived and fitted to the impedance data to explain changes of the kinetics in the system.
Keywords
- charge-transfer kinetics, gold, intensity-modulated photocurrent spectroscopy, nanorods, submonolayers
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Electrochemistry
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In: CHEMELECTROCHEM, Vol. 5, No. 1, 02.01.2018, p. 175-186.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold-Decorated Cadmium Chalcogenide Nanorods
AU - Miethe, Jan F.
AU - Lübkemann, Franziska
AU - Poppe, Jan
AU - Steinbach, Frank
AU - Dorfs, Dirk
AU - Bigall, Nadja C.
N1 - © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/1/2
Y1 - 2018/1/2
N2 - The interfacial transfer of charge carriers across the semiconductor nanoparticle/electrolyte boundary is an elementary process for applications such as photoelectrochemical sensing and photocatalysis. This mechanism is investigated for systems based on complex shaped semiconductor and metal-semiconductor nano-heteroparticles. In the present work the influence of the presence of a CdSe domain within the CdS nanorod as well as the influence of gold domain decoration is investigated spectroelectrochemically. Therefore, the mentioned nanoparticles are linked to transparent indium tin oxide (ITO) glass slides via (3-mercaptopropyl)trimethoxysilane (MPTMS). This preparation yields sub-monolayers of the particles. External photocurrent quantum efficiency spectra are measured in the range from λ=350–650 nm. Intensity-modulated photocurrent spectroscopy (IMPS) and electrochemical impedance spectroscopy (EIS) measurements are applied to the samples in order to reveal and explain the differences of the electrochemical kinetics between the four different particle types (CdS, CdSe/CdS, CdS−Au, and CdSe/CdS−Au nanorods). We demonstrate that the presence of gold domains affects the carrier dynamics of various involved processes. An equivalent circuit model is derived and fitted to the impedance data to explain changes of the kinetics in the system.
AB - The interfacial transfer of charge carriers across the semiconductor nanoparticle/electrolyte boundary is an elementary process for applications such as photoelectrochemical sensing and photocatalysis. This mechanism is investigated for systems based on complex shaped semiconductor and metal-semiconductor nano-heteroparticles. In the present work the influence of the presence of a CdSe domain within the CdS nanorod as well as the influence of gold domain decoration is investigated spectroelectrochemically. Therefore, the mentioned nanoparticles are linked to transparent indium tin oxide (ITO) glass slides via (3-mercaptopropyl)trimethoxysilane (MPTMS). This preparation yields sub-monolayers of the particles. External photocurrent quantum efficiency spectra are measured in the range from λ=350–650 nm. Intensity-modulated photocurrent spectroscopy (IMPS) and electrochemical impedance spectroscopy (EIS) measurements are applied to the samples in order to reveal and explain the differences of the electrochemical kinetics between the four different particle types (CdS, CdSe/CdS, CdS−Au, and CdSe/CdS−Au nanorods). We demonstrate that the presence of gold domains affects the carrier dynamics of various involved processes. An equivalent circuit model is derived and fitted to the impedance data to explain changes of the kinetics in the system.
KW - charge-transfer kinetics
KW - gold
KW - intensity-modulated photocurrent spectroscopy
KW - nanorods
KW - submonolayers
UR - http://www.scopus.com/inward/record.url?scp=85034641636&partnerID=8YFLogxK
U2 - 10.15488/11921
DO - 10.15488/11921
M3 - Article
AN - SCOPUS:85034641636
VL - 5
SP - 175
EP - 186
JO - CHEMELECTROCHEM
JF - CHEMELECTROCHEM
SN - 2196-0216
IS - 1
ER -