Silver-Assisted Colloidal Synthesis of Stable, Plasmon Resonant Gold Patches on Silica Nanospheres

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Bao H, Butz B, Zhou Z, Spiecker E, Hartmann M, Klupp Taylor R
Zeitschrift: Langmuir
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2012
Band: 28
Heftnummer: 24
Seitenbereich: 8971-8978
ISSN: 0743-7463
eISSN: 1520-5827
Sprache: Englisch


Abstract


Patchy particles possessing heterogeneous surface composition show great promise as self-organizing building blocks for new classes of hierarchical functional structures. A major hurdle is the scalable synthesis of stable patches on nanosized core particles with arbitrarily defined patch number and coverage. So far, few methods have been reported which could be expected to meet these challenges. Recently, we described the heterogeneous nucleation and growth of silver patches on silica nanospheres via a template free colloidal route. The patches produced, although tunable in size and number and showing interesting plasmon resonant properties, were rather unstable and degraded rapidly during attempts to process them further. In the present work, therefore, we set out to explore if related approaches can be employed to produce patchy particles involving gold, which is known to be more stable. The differences between typical patch precursors Ag+ and [AuClx(OH)(4-x)](-) and their respective interactions with amorphous silica make this a significant challenge. We show that preformed small silver patches in addition to the presence of a reducing agent are necessary for the formation of gold patches conformal to the silica nanosphere surface. Systematic study of the process parameters and their influence on the patchy particle morphology as well as in-depth analytical transmission electron microscopy investigation of the patch composition reveal that patches spread over the silica surface via a cycle of galvanic dissolution and redeposition of silver. The resulting gold patchy particles remain stable during subsequent storage or washing and display tunable plasmon resonances within the visible and near-IR spectrum.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bao, Huixin
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Butz, Benjamin Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Hartmann, Martin Prof. Dr.
Professur für Katalyse
Klupp Taylor, Robin Prof.
Professur für Nanostructured Particles
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Zhou, Zhou Dr.
Interdisziplinäres Zentrum Erlangen Catalysis Resource Center (ECRC)


Zusätzliche Organisationseinheit(en)
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Zitierweisen

APA:
Bao, H., Butz, B., Zhou, Z., Spiecker, E., Hartmann, M., & Klupp Taylor, R. (2012). Silver-Assisted Colloidal Synthesis of Stable, Plasmon Resonant Gold Patches on Silica Nanospheres. Langmuir, 28(24), 8971-8978. https://dx.doi.org/10.1021/la204762z

MLA:
Bao, Huixin, et al. "Silver-Assisted Colloidal Synthesis of Stable, Plasmon Resonant Gold Patches on Silica Nanospheres." Langmuir 28.24 (2012): 8971-8978.

BibTeX: 

Zuletzt aktualisiert 2019-23-08 um 09:17