3 years ago

Precise Control of the Lateral and Vertical Growth of Two-Dimensional Ag Nanoplates

Precise Control of the Lateral and Vertical Growth of Two-Dimensional Ag Nanoplates
Chengyu Li, Cheng Wang, Lili Yao, Huiling Liu, Taixing Tan
Tuning localized surface plasmon resonance (LSPR) is crucial for practical applications of two-dimensional Ag nanoplates (AgNPs) and relies on the precise control of their lateral length or/and thickness. In the present seed-mediated synthetic method, by taking advantage of underpotential deposition (UPD) of Cu on the (111) surfaces of AgNPs, a solely lateral growth of AgNPs was achieved when Cu(NO3)2 was employed, while a vertical growth of AgNPs could be attained by introducing CuCl2 into our growth solutions. The lateral length and the vertical thickness of the AgNPs could be tuned in the ranges of 115 to nearly 300 nm and 13.4 to around 200 nm, respectively. Along with control of the dimensional size of AgNPs, LSPR could also be tuned in the visible to near infrared range. Plausible growth mechanisms for the precise control of the lateral and vertical growth of AgNPs were proposed. Direction-controlled growth: The growth direction of Ag nanoplates can be precisely controlled along the lateral or vertical direction exclusively by introduction of Cu(NO3)2 or CuCl2, respectively. The lateral growth was favored by Cu underpotential deposition (UDP) formed on (111) faces, while the vertical growth was dominated in the coexistence of Cl− and Cu2+.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701146

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