TY - JOUR

T1 - Effect of diaminostilbene as a molecular linker on Ag nanoparticles

T2 - SERS study of aggregation and interparticle hot spots in various environments

AU - Solovyeva, Elena V.

AU - Ubyivovk, Evgeniy V.

AU - Denisova, Anna S.

PY - 2018/2/5

Y1 - 2018/2/5

N2 - 4,4′-diaminostilbene (DAS) was used as a molecular linker of Ag nanoparticles prepared by reduction of silver nitrate by sodium borohydride. The influence of DAS concentration on the nanoparticles aggregation was investigated by Surface enhanced Raman scattering (SERS), UV–vis spectroscopy, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It is revealed that linking Ag nanoparticles with hot spots formation occurs only at sub- or monolayer surface coverage up to 5 × 10−6 mol/l. At multilayer coverage, only single-end interaction of molecules with a surface is possible. The effects of pH and halide salts on the adsorption mechanism of DAS were also checked. The protonation of amino groups and presence of chloride anions on a surface prevent the linkage of Ag nanoparticles. As a result, a simple and versatile method for obtaining Ag nanoparticle aggregates of controllable size and optical properties is proposed. The corresponding limitations are described for a potential application of the developed hot spots substrates.

AB - 4,4′-diaminostilbene (DAS) was used as a molecular linker of Ag nanoparticles prepared by reduction of silver nitrate by sodium borohydride. The influence of DAS concentration on the nanoparticles aggregation was investigated by Surface enhanced Raman scattering (SERS), UV–vis spectroscopy, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It is revealed that linking Ag nanoparticles with hot spots formation occurs only at sub- or monolayer surface coverage up to 5 × 10−6 mol/l. At multilayer coverage, only single-end interaction of molecules with a surface is possible. The effects of pH and halide salts on the adsorption mechanism of DAS were also checked. The protonation of amino groups and presence of chloride anions on a surface prevent the linkage of Ag nanoparticles. As a result, a simple and versatile method for obtaining Ag nanoparticle aggregates of controllable size and optical properties is proposed. The corresponding limitations are described for a potential application of the developed hot spots substrates.

KW - Diamines

KW - Hot spots

KW - Molecular linker

KW - Silver nanoparticles

KW - Stilbene derivatives

KW - Surface-enhanced raman spectroscopy

KW - SIZE

KW - SENSITIVITY

KW - ENHANCED RAMAN-SCATTERING

KW - ADSORPTION

KW - SILVER NANOPARTICLES

KW - SPECTROSCOPY

KW - ASSEMBLIES

KW - PHOTOCHEMISTRY

KW - PLASMONIC NANOPARTICLES

UR - http://www.scopus.com/inward/record.url?scp=85034414284&partnerID=8YFLogxK

U2 - 10.1016/j.colsurfa.2017.11.040

DO - 10.1016/j.colsurfa.2017.11.040

M3 - Article

AN - SCOPUS:85034414284

VL - 538

SP - 542

EP - 548

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

ER -