TY - JOUR
T1 - (1 1 1)-facet dominant ultrafine nanoporous silver as SERS substrates with high sensitivities and ultrahigh detection limits
AU - Yuan, Yuan
AU - Zhou, Zijie
AU - Luo, Jiayu
AU - Dan, Zhenhua
AU - Qin, Fengxiang
AU - Chang, Hui
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/8/1
Y1 - 2021/8/1
N2 - (1 1 1)-facet dominant nanoporous Ag (ONP-Ag@-0.5 V) has been fabricated by electrochemical dealloying of Ag20Zn80 precursor alloys composed of ε-AgZn3 single phase in 0.5 M KOH solution at the applied potential of −0.5 V. The ONP-Ag@-0.5 V has a finer nanoporous structure with an average pore size of 16 nm and the specific surface area of 13.0 m2 g−1. The Surface-enhanced Raman scattering (SERS) activity of the ONP-Ag@-0.5 V for Rhodamine 6G (R6G) Raman probe is evaluated to be with a SERS enhancement factor of 2.53 × 1010 and limit of SERS detection of 4.8 × 10−14 M. The superior SERS activities mainly arise from the local electromagnetic enhancement effects of ultrafine (1 1 1)-facet dominant nanoporous structure and the narrow ligaments, the edge effects from co-distribution of Ag bumps, the plasmonic effect of the embedded ZnO, as well as the chemical enhancement of (1 1 1)-facet adsorption of more R6G molecules.
AB - (1 1 1)-facet dominant nanoporous Ag (ONP-Ag@-0.5 V) has been fabricated by electrochemical dealloying of Ag20Zn80 precursor alloys composed of ε-AgZn3 single phase in 0.5 M KOH solution at the applied potential of −0.5 V. The ONP-Ag@-0.5 V has a finer nanoporous structure with an average pore size of 16 nm and the specific surface area of 13.0 m2 g−1. The Surface-enhanced Raman scattering (SERS) activity of the ONP-Ag@-0.5 V for Rhodamine 6G (R6G) Raman probe is evaluated to be with a SERS enhancement factor of 2.53 × 1010 and limit of SERS detection of 4.8 × 10−14 M. The superior SERS activities mainly arise from the local electromagnetic enhancement effects of ultrafine (1 1 1)-facet dominant nanoporous structure and the narrow ligaments, the edge effects from co-distribution of Ag bumps, the plasmonic effect of the embedded ZnO, as well as the chemical enhancement of (1 1 1)-facet adsorption of more R6G molecules.
KW - (1 1 1)-facet dominance
KW - Electrochemical dealloying
KW - Single-phase AgZn precursor alloy
KW - Surface-enhanced Raman scattering
KW - Ultrafine nanoporous silver
UR - http://www.scopus.com/inward/record.url?scp=85104749667&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2021.149820
DO - 10.1016/j.apsusc.2021.149820
M3 - 文章
AN - SCOPUS:85104749667
SN - 0169-4332
VL - 556
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 149820
ER -