TY - JOUR
T1 - Surface modification of Au and Ag plasmonic thin films via diazonium chemistry
T2 - Evaluation of structure and properties
AU - Guselnikova, Oleksiy
AU - Postnikov, Pavel
AU - Elashnikov, Roman
AU - Trusova, Marina
AU - Kalachyova, Yevgeniya
AU - Libansky, Milan
AU - Barek, Jiri
AU - Kolska, Zdenka
AU - Švorčík, Vaclav
AU - Lyutakov, Oleksiy
PY - 2017/3/5
Y1 - 2017/3/5
N2 - Plasmon-active noble metals nanostructures based on Ag and Au thin films become widely applied in the field of plasmonics and related sensing technologies. For improvement of the metal interaction with different media, metals surface can be functionalized in order to increase/decrease hydrophilicity, lipophilicity or introduce/change the surface charge. In this paper, the surface functionalization of plasmon-active Au and Ag films using arenediazonium tosylates was described. The surface functionalization was performed in the aqueous medium by the spontaneous and electrically induced mechanisms. Functionalized surfaces were characterized by the Raman and UV–vis spectroscopies, AFM nanomechanical mapping, SEM (EDX), XPS, CVA, zeta- potential, and water contact angle measurement techniques. It was founded that the key difference between reactivity of gold and silver films is distributional behavior of grafted organic functional groups: silver has higher tendency to form clustered, island-like structure while gold is covered more homogeneously. Spontaneous modification forms approximately monomolecular thick films of organic compounds and can be used in the field of SPR or SERS sensors. Electrochemically induced activation produces thick polyphenylene layer on the metal surface and can find application in the field of tunable plasmonic devices or plasmon-based lasers.
AB - Plasmon-active noble metals nanostructures based on Ag and Au thin films become widely applied in the field of plasmonics and related sensing technologies. For improvement of the metal interaction with different media, metals surface can be functionalized in order to increase/decrease hydrophilicity, lipophilicity or introduce/change the surface charge. In this paper, the surface functionalization of plasmon-active Au and Ag films using arenediazonium tosylates was described. The surface functionalization was performed in the aqueous medium by the spontaneous and electrically induced mechanisms. Functionalized surfaces were characterized by the Raman and UV–vis spectroscopies, AFM nanomechanical mapping, SEM (EDX), XPS, CVA, zeta- potential, and water contact angle measurement techniques. It was founded that the key difference between reactivity of gold and silver films is distributional behavior of grafted organic functional groups: silver has higher tendency to form clustered, island-like structure while gold is covered more homogeneously. Spontaneous modification forms approximately monomolecular thick films of organic compounds and can be used in the field of SPR or SERS sensors. Electrochemically induced activation produces thick polyphenylene layer on the metal surface and can find application in the field of tunable plasmonic devices or plasmon-based lasers.
KW - Diazonium chemistry
KW - Plasmonic thin films
KW - Surface modification
KW - Surface properties
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U2 - 10.1016/j.colsurfa.2016.12.040
DO - 10.1016/j.colsurfa.2016.12.040
M3 - Article
AN - SCOPUS:85007414173
VL - 516
SP - 274
EP - 285
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
ER -