Nanoparticle assemblies for solar to chemical energy conversion

Dongil Lee, Junhyung Kim, Mariana Kondon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Energy and electron transfer processes between photo-excited semiconductor and metal are important phenomena in photocatalysts. While metals in contact with semiconductor nanoparticles have been employed to enhance the overall photocatalytic activity, the interfacial electron and energy transfer processes are yet to be understood fully. We present excited-state deactivation studies of photoactive semiconductor nanoparticles, such as TiO2 and CdSe quantum dots (QDs), by structurally and energetically well-defined alkanethiolate-coated monolayer-protected gold clusters (MPCs) with core size ranging 1-5 nm. The charge transfer efficiency from a photo-excited TiO2 to MPCs was monitored by the decrease in the blue coloration due to photogenerated electrons. The charge transfer efficiency significantly increased as increasing MPC core size from 1 to 5 nm, revealing the effect of the charging capacitance of MPCs. The MPC core-size dependent deactivation process was also found in a CdSe QD-MPC system. The emission spectra of CdSe QDs were collected as a function of MPC concentration in the mixture of the QD and MPC colloidal solution. The resulting Stern-Volmer quenching constants were found to increase considerably as increasing the MPC core-size from 1 to 5 nm.

Original languageEnglish
Title of host publication234th ACS National Meeting, Abstracts of Scientific Papers
Publication statusPublished - 2007 Dec 31
Event234th ACS National Meeting - Boston, MA, United States
Duration: 2007 Aug 192007 Aug 23

Other

Other234th ACS National Meeting
CountryUnited States
CityBoston, MA
Period07/8/1907/8/23

Fingerprint

Energy conversion
Gold
Monolayers
Nanoparticles
Semiconductor quantum dots
Semiconductor materials
Electrons
Charge transfer
Metals
Photocatalysts
Excited states
Energy transfer
Quenching
Capacitance

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Lee, D., Kim, J., & Kondon, M. (2007). Nanoparticle assemblies for solar to chemical energy conversion. In 234th ACS National Meeting, Abstracts of Scientific Papers
Lee, Dongil ; Kim, Junhyung ; Kondon, Mariana. / Nanoparticle assemblies for solar to chemical energy conversion. 234th ACS National Meeting, Abstracts of Scientific Papers. 2007.
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abstract = "Energy and electron transfer processes between photo-excited semiconductor and metal are important phenomena in photocatalysts. While metals in contact with semiconductor nanoparticles have been employed to enhance the overall photocatalytic activity, the interfacial electron and energy transfer processes are yet to be understood fully. We present excited-state deactivation studies of photoactive semiconductor nanoparticles, such as TiO2 and CdSe quantum dots (QDs), by structurally and energetically well-defined alkanethiolate-coated monolayer-protected gold clusters (MPCs) with core size ranging 1-5 nm. The charge transfer efficiency from a photo-excited TiO2 to MPCs was monitored by the decrease in the blue coloration due to photogenerated electrons. The charge transfer efficiency significantly increased as increasing MPC core size from 1 to 5 nm, revealing the effect of the charging capacitance of MPCs. The MPC core-size dependent deactivation process was also found in a CdSe QD-MPC system. The emission spectra of CdSe QDs were collected as a function of MPC concentration in the mixture of the QD and MPC colloidal solution. The resulting Stern-Volmer quenching constants were found to increase considerably as increasing the MPC core-size from 1 to 5 nm.",
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Lee, D, Kim, J & Kondon, M 2007, Nanoparticle assemblies for solar to chemical energy conversion. in 234th ACS National Meeting, Abstracts of Scientific Papers. 234th ACS National Meeting, Boston, MA, United States, 07/8/19.

Nanoparticle assemblies for solar to chemical energy conversion. / Lee, Dongil; Kim, Junhyung; Kondon, Mariana.

234th ACS National Meeting, Abstracts of Scientific Papers. 2007.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Kim, Junhyung

AU - Kondon, Mariana

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N2 - Energy and electron transfer processes between photo-excited semiconductor and metal are important phenomena in photocatalysts. While metals in contact with semiconductor nanoparticles have been employed to enhance the overall photocatalytic activity, the interfacial electron and energy transfer processes are yet to be understood fully. We present excited-state deactivation studies of photoactive semiconductor nanoparticles, such as TiO2 and CdSe quantum dots (QDs), by structurally and energetically well-defined alkanethiolate-coated monolayer-protected gold clusters (MPCs) with core size ranging 1-5 nm. The charge transfer efficiency from a photo-excited TiO2 to MPCs was monitored by the decrease in the blue coloration due to photogenerated electrons. The charge transfer efficiency significantly increased as increasing MPC core size from 1 to 5 nm, revealing the effect of the charging capacitance of MPCs. The MPC core-size dependent deactivation process was also found in a CdSe QD-MPC system. The emission spectra of CdSe QDs were collected as a function of MPC concentration in the mixture of the QD and MPC colloidal solution. The resulting Stern-Volmer quenching constants were found to increase considerably as increasing the MPC core-size from 1 to 5 nm.

AB - Energy and electron transfer processes between photo-excited semiconductor and metal are important phenomena in photocatalysts. While metals in contact with semiconductor nanoparticles have been employed to enhance the overall photocatalytic activity, the interfacial electron and energy transfer processes are yet to be understood fully. We present excited-state deactivation studies of photoactive semiconductor nanoparticles, such as TiO2 and CdSe quantum dots (QDs), by structurally and energetically well-defined alkanethiolate-coated monolayer-protected gold clusters (MPCs) with core size ranging 1-5 nm. The charge transfer efficiency from a photo-excited TiO2 to MPCs was monitored by the decrease in the blue coloration due to photogenerated electrons. The charge transfer efficiency significantly increased as increasing MPC core size from 1 to 5 nm, revealing the effect of the charging capacitance of MPCs. The MPC core-size dependent deactivation process was also found in a CdSe QD-MPC system. The emission spectra of CdSe QDs were collected as a function of MPC concentration in the mixture of the QD and MPC colloidal solution. The resulting Stern-Volmer quenching constants were found to increase considerably as increasing the MPC core-size from 1 to 5 nm.

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Lee D, Kim J, Kondon M. Nanoparticle assemblies for solar to chemical energy conversion. In 234th ACS National Meeting, Abstracts of Scientific Papers. 2007