jp412194q_si_001.pdf (5.56 MB)
Additive-Free Shape-Invariant Nano-to-Micron Size-Tuning of Cu2O Cubic Crystals by Square-Wave Voltammetry
journal contribution
posted on 2014-05-22, 00:00 authored by Xuyun Guo, Weiqiang Lv, Xiao-Yuan LiWe
demonstrate in this study the application of square-wave voltammetry
(SWV), an electrochemical technique that has been commonly employed
in electroanalysis but much less utilized in electrocrystallization,
in the shape-invariant size-tuning of the electrodeposited cuprous
oxide (Cu2O) crystalline cubic particles from ∼30
nm to 3 μm in aqueous solution under ambient conditions without
using any organic surfactant and surface capping agent. We show systematically
how each and every adjustable parameter in SWV technique affects the
size-tuning of Cu2O nanocubes under shape invariance. A
systematic comparison was made between SWV and several other EC techniques,
including linear-sweep voltammetry (LSV), stair-case voltammetry (SCV),
chronoamperometry (CA or simple i vs t), square-wave chronoamperometry (SWCA), and differential pulse voltammetry
(DPV), for the shape-invariant electrodeposition of crystalline Cu2O nanocubes. The as-fabricated Cu2O nanocubes were
employed as the size- and shape-controlled galvanic templates to fabricate
Cu2O@Ag core–shell structures which display excellent
performance in “single-particle” surface-enhanced Raman
spectroscopy (sp-SERS).