TY - JOUR
T1 - Thermo-switchable charge transport and electrocatalysis using metal-ion-modified pNIPAM-functionalized electrodes
AU - Riskin, Michael
AU - Tel-Vered, Ran
AU - Willner, Itamar
PY - 2009/8/10
Y1 - 2009/8/10
N2 - Metal ions (Ag+, Cu2+, Hg2+) are incorporated into an electropolymerized, poly(N-isopropyl acrylamide), pNIPAM, thermosensitive polymer associated with an electrode using the "breathing-in" method. The ion-functionalized pNIPAM matrices reveal ion-dependent gel-to-solid phase-transition temperatures (28 ± 1 °C, 25 ± 1 °C, 40 ± 1 °C for the Ag+, Cu2+, and Hg2+modified pNIPAM, respectively). Furthermore, the ion-functionalized polymers exhibit quasi-reversible redox properties, and the ions are reduced to the respective Ag°, Cu°, and Hg° nanocluster-modified polymers. The metal-nanoeluster-functionalized pNIPAM matrices enhance the electron transfer (they exhibit lower electron-transfer resistances) in the compacted states. The electron-transfer resistances of the metal-nanocluster-modified pNIPAM can be cycled between low and high values by temperature-induced switching of the polymer between its contracted solid and expanded gel states, respectively. The enhanced electron-transfer properties of the metal nanocluster-functional ized polymer are attributed to the contacting of the metal nanoclusters in the contracted state of the polymers. This temperatureswitchable electron transfer across a Ag°-modified pNIPAM was implemented to design a thermo-switchable electrocatalytic process (the temperature-switchable electrocatalyzed reduction Of H2O2 by Ag°-pNIPAM).
AB - Metal ions (Ag+, Cu2+, Hg2+) are incorporated into an electropolymerized, poly(N-isopropyl acrylamide), pNIPAM, thermosensitive polymer associated with an electrode using the "breathing-in" method. The ion-functionalized pNIPAM matrices reveal ion-dependent gel-to-solid phase-transition temperatures (28 ± 1 °C, 25 ± 1 °C, 40 ± 1 °C for the Ag+, Cu2+, and Hg2+modified pNIPAM, respectively). Furthermore, the ion-functionalized polymers exhibit quasi-reversible redox properties, and the ions are reduced to the respective Ag°, Cu°, and Hg° nanocluster-modified polymers. The metal-nanoeluster-functionalized pNIPAM matrices enhance the electron transfer (they exhibit lower electron-transfer resistances) in the compacted states. The electron-transfer resistances of the metal-nanocluster-modified pNIPAM can be cycled between low and high values by temperature-induced switching of the polymer between its contracted solid and expanded gel states, respectively. The enhanced electron-transfer properties of the metal nanocluster-functional ized polymer are attributed to the contacting of the metal nanoclusters in the contracted state of the polymers. This temperatureswitchable electron transfer across a Ag°-modified pNIPAM was implemented to design a thermo-switchable electrocatalytic process (the temperature-switchable electrocatalyzed reduction Of H2O2 by Ag°-pNIPAM).
UR - http://www.scopus.com/inward/record.url?scp=68249100234&partnerID=8YFLogxK
U2 - 10.1002/adfm.200900268
DO - 10.1002/adfm.200900268
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AN - SCOPUS:68249100234
SN - 1616-301X
VL - 19
SP - 2474
EP - 2480
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 15
ER -