Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges
The present study investigates the photocatalytic activity of ZnSe/CdS core/shell semiconductor nanocrystals. These nanoparticles exhibit a spatial separation of photoinduced charges between the core and the shell domains, which makes them potentially viable for photocatalytic applications. Unfortun...
محفوظ في:
| المؤلف الرئيسي: | |
|---|---|
| مؤلفون آخرون: | , , , , , , |
| التنسيق: | article |
| منشور في: |
2012
|
| الوصول للمادة أونلاين: | http://hdl.handle.net/10725/6497 http://dx.doi.org/10.1021/jp308921s http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php http://pubs.acs.org/doi/abs/10.1021/jp308921s |
| الوسوم: |
إضافة وسم
لا توجد وسوم, كن أول من يضع وسما على هذه التسجيلة!
|
| _version_ | 1864513480165425152 |
|---|---|
| author | Perera, Dimuthu |
| author2 | Lorek, Ryan Khnayzer, Rony S. Moroz, Pavel O'Connor, Timothy Khon, Dimitry Diedrich, Geoffrey Kinder, Erich |
| author2_role | author author author author author author author |
| author_facet | Perera, Dimuthu Lorek, Ryan Khnayzer, Rony S. Moroz, Pavel O'Connor, Timothy Khon, Dimitry Diedrich, Geoffrey Kinder, Erich |
| author_role | author |
| dc.creator.none.fl_str_mv | Perera, Dimuthu Lorek, Ryan Khnayzer, Rony S. Moroz, Pavel O'Connor, Timothy Khon, Dimitry Diedrich, Geoffrey Kinder, Erich |
| dc.date.none.fl_str_mv | 2012 2017-11-03T10:33:06Z 2017-11-03T10:33:06Z 2017-11-03 |
| dc.identifier.none.fl_str_mv | 1932-7455 http://hdl.handle.net/10725/6497 http://dx.doi.org/10.1021/jp308921s Perera, D., Lorek, R., Khnayzer, R. S., Moroz, P., O’Connor, T., Khon, D., ... & Zamkov, M. (2012). Photocatalytic activity of core/shell semiconductor nanocrystals featuring spatial separation of charges. The Journal of Physical Chemistry C, 116(43), 22786-22793. http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php http://pubs.acs.org/doi/abs/10.1021/jp308921s |
| dc.language.none.fl_str_mv | en |
| dc.relation.none.fl_str_mv | Journal of Physical Chemistry C |
| dc.rights.*.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.title.none.fl_str_mv | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| dc.type.none.fl_str_mv | Article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
| description | The present study investigates the photocatalytic activity of ZnSe/CdS core/shell semiconductor nanocrystals. These nanoparticles exhibit a spatial separation of photoinduced charges between the core and the shell domains, which makes them potentially viable for photocatalytic applications. Unfortunately, one of the excited charges remains inside the core semiconductor and thus cannot efficiently react with the external environment. Here, we explore this issue by investigating the mechanisms of hole extraction from the ZnSe core to the surface of the CdS shell. In particular, the effect of shell thickness in ZnSe/CdS core/shell nanocrystals on the ability of core-localized charges to perform oxidative reactions was determined. By using a combination of time-resolved spectroscopy and electrochemical techniques, we demonstrate that the use of hole-scavenging surfactants facilitates an efficient transfer of core-localized holes to the surface even in the case of shells exceeding 7 nm in thickness. These measurements further demonstrate that photoinduced holes can be extracted from the core faster than they recombine with shell-localized electrons, indicating that most of the absorbed energy in ZnSe/CdS nanocrystals can be used to drive catalytic reactions. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | LAURepo_6ca7835b60acfe6e943f698ffee3a87b |
| identifier_str_mv | 1932-7455 Perera, D., Lorek, R., Khnayzer, R. S., Moroz, P., O’Connor, T., Khon, D., ... & Zamkov, M. (2012). Photocatalytic activity of core/shell semiconductor nanocrystals featuring spatial separation of charges. The Journal of Physical Chemistry C, 116(43), 22786-22793. |
| language_invalid_str_mv | en |
| network_acronym_str | LAURepo |
| network_name_str | Lebanese American University repository |
| oai_identifier_str | oai:laur.lau.edu.lb:10725/6497 |
| publishDate | 2012 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of chargesPerera, DimuthuLorek, RyanKhnayzer, Rony S.Moroz, PavelO'Connor, TimothyKhon, DimitryDiedrich, GeoffreyKinder, ErichThe present study investigates the photocatalytic activity of ZnSe/CdS core/shell semiconductor nanocrystals. These nanoparticles exhibit a spatial separation of photoinduced charges between the core and the shell domains, which makes them potentially viable for photocatalytic applications. Unfortunately, one of the excited charges remains inside the core semiconductor and thus cannot efficiently react with the external environment. Here, we explore this issue by investigating the mechanisms of hole extraction from the ZnSe core to the surface of the CdS shell. In particular, the effect of shell thickness in ZnSe/CdS core/shell nanocrystals on the ability of core-localized charges to perform oxidative reactions was determined. By using a combination of time-resolved spectroscopy and electrochemical techniques, we demonstrate that the use of hole-scavenging surfactants facilitates an efficient transfer of core-localized holes to the surface even in the case of shells exceeding 7 nm in thickness. These measurements further demonstrate that photoinduced holes can be extracted from the core faster than they recombine with shell-localized electrons, indicating that most of the absorbed energy in ZnSe/CdS nanocrystals can be used to drive catalytic reactions.PublishedN/A2017-11-03T10:33:06Z2017-11-03T10:33:06Z20122017-11-03Articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1932-7455http://hdl.handle.net/10725/6497http://dx.doi.org/10.1021/jp308921sPerera, D., Lorek, R., Khnayzer, R. S., Moroz, P., O’Connor, T., Khon, D., ... & Zamkov, M. (2012). Photocatalytic activity of core/shell semiconductor nanocrystals featuring spatial separation of charges. The Journal of Physical Chemistry C, 116(43), 22786-22793.http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.phphttp://pubs.acs.org/doi/abs/10.1021/jp308921senJournal of Physical Chemistry Cinfo:eu-repo/semantics/openAccessoai:laur.lau.edu.lb:10725/64972021-03-19T10:03:26Z |
| spellingShingle | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges Perera, Dimuthu |
| status_str | publishedVersion |
| title | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| title_full | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| title_fullStr | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| title_full_unstemmed | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| title_short | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| title_sort | Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges |
| url | http://hdl.handle.net/10725/6497 http://dx.doi.org/10.1021/jp308921s http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php http://pubs.acs.org/doi/abs/10.1021/jp308921s |