Plasmonic smart dust for probing local chemical reactions

Publikationstyp
Journal Article
Date Issued
2013-04-10
Sprache
English
Author(s)
Tittl, Andreas 
Yin, Xinghui
Giessen, Harald
Tian, Xiang Dong
Tian, Zhong Qun
Kremers, Christian
Chigrin, Dmitry N.
Liu, Na
TORE-URI
https://hdl.handle.net/11420/61998
Journal
Nano letters  
Volume
13
Issue
4
Start Page
1816
End Page
1821
Citation
Nano Letters 13 (4): 1816-1821 (2013)
Publisher DOI
10.1021/nl4005089
Scopus ID
2-s2.0-84876026234
ISSN
15306984
Locally probing chemical reactions or catalytic processes on surfaces under realistic reaction conditions has remained one of the main challenges in materials science and heterogeneous catalysis. Where conventional surface interrogation techniques usually require high-vacuum conditions or ensemble average measurements, plasmonic nanoparticles excel in extreme light focusing and can produce highly confined electromagnetic fields in subwavelength volumes without the need for complex near-field microscopes. Here, we demonstrate an all-optical probing technique based on plasmonic smart dust for monitoring local chemical reactions in real time. The silica shell-isolated gold nanoparticles that form the smart dust can work as strong light concentrators and optically report subtle environmental changes at their pinning sites on the probed surface during reaction processes. As a model system, we investigate the hydrogen dissociation and subsequent uptake trajectory in palladium with both "dust-on-film" and "film-on-dust" platforms. Using time-resolved single particle measurements, we demonstrate that our technique can in situ encode chemical reaction information as optical signals for a variety of surface morphologies. The presented technique offers a unique scheme for real-time, label-free, and high-resolution probing of local reaction kinetics in a plethora of important chemical reactions on surfaces, paving the way toward the development of inexpensive and high-output reaction sensors for real-world applications.
Subjects
hydrogen sensing
local chemical reactions
palladium
Plasmonics
smart dust
DDC Class
600: Technology