Modification of gold electrode with a monolayer of self-assembled microgels
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Warszawski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Electrochimica Acta (40pkt w roku publikacji)
ISSN
0013-4686
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
URL
Rok publikacji
2018
Numer zeszytu
Strony od-do
531-538
Numer tomu
268
Link do pełnego tekstu
Liczba arkuszy
Słowa kluczowe
en
Modification of electrode
Microgel monolayer
Self-assembly
Environmental sensitivity
Streszczenia
Język
en
Treść
A new method of modification of the gold-electrode surface with a microgel monolayer was developed. Microgel particles contained eS-Se groups to enable modification of the gold surface by self-assembly via the chemisorption process. The particles were obtained by precipitation polymerization of N-isopropylacrylamide with N,N0-bis(acryloyl)cystine cross-linker. Their spherical shape and highly uniform dispersion were confirmed by electron microscopies (SEM and TEM). Thermosensitivity of the microgel was investigated with dynamic light scattering (DLS). The formation of monolayers was monitored with a quartz-crystal microbalance. The morphology of the modified surface in its dry state and in aqueous environment was investigated with atomic force microscopy (AFM). At temperatures below the volumephase-transition temperature the microgels formed a densely packed structure that well covered theentire surface. A significant change in morphology was observed after raising temperature above the volume-phase-transition temperature. The observed increase in roughness of the modified surface suggested that the surface of electrode could be locally, between the microgel particles, uncovered. The electrochemical properties of the modified electrode were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). A strong influence of the volume phase transition in the microgels attached to the Au surface on CV and EIS responses of the modified electrode was found. The observed behavior was reversed to that of the electrodes modified with a thin thermosensitive gel film based on N-isopropylacrylamide, i.e. the volume phase transition led to a significant increase in the voltammetric current and to a drop in electron transfer resistance. That was related to partial uncovering of the electrode surface after the shrinking process in the microgels.
Cechy publikacji
Original article
Original article presents the results of original research or experiment
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Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu
Inne
System-identifier
PX-5c4c463dd5defe0a4261faed
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