Fabrication of Bimetallic Au-Pd-Au Nanobricks as an Archetype of Robust Nanoplasmonic Sensors

Ka Chon Ng, Fan Cheng Lin, Po Wei Yang, Yu Chun Chuang, Chung Kai Chang, Ai Hsuan Yeh, Chin Sheng Kuo, Chen Rui Kao, Chia Chi Liu, U. Ser Jeng, Jer Shing Huang*, Chun-Hong Kuo


研究成果: Article同行評審

17 引文 斯高帕斯(Scopus)


Conventional gas sensors work upon changes in mechanical or conductive properties of sensing materials during a chemical process, which may limit availabilities of size miniaturization and design simplification. However, fabrication of miniaturized sensors with superior sensitivities in real-time and label-free probing of chemical reactions or catalytic processes remains highly challenging, in particular with regard to integration of materials into a desired smaller volume without losing the recyclability of sensing properties. Here, we demonstrate a unique bimetallic nanostructure, the Au-Pd-Au core-shell-frame nanobrick, as a promising archetype for fabrication of miniaturized sensors at nanoscale. Upon analysis of the aqueous synthesis, both ex situ and in situ, the formation of Au frames is consistent with selective deposition and aggregation of NaBH4-reduced Au nanoparticles at the corners and edges of cubic Pd shells, where the {100} surfaces, capped by iodide ions, are growth-limited. By virtue of the thin Pd shell (∼3.5 nm) sandwiched in-between the two Au layers of the core and the frame, the Au-Pd-Au nanobrick yields excellent optical sensitivity in hydrogen gas sensing, leading to a large 13 nm spectral shift of light scattering between Pd and PdHx. The composite nanostructure with a size of ∼60 nm offers an archetype for miniaturized sensors possessing label-free, real-time, and high-resolution probing abilities and hence paves the way for fabrication of highly efficient nanosensors via sustainable methods.

頁(從 - 到)204-213
期刊Chemistry of Materials
出版狀態Published - 9 1月 2018


深入研究「Fabrication of Bimetallic Au-Pd-Au Nanobricks as an Archetype of Robust Nanoplasmonic Sensors」主題。共同形成了獨特的指紋。