Wireless Synthesis and Activation of Electrochemiluminescent
Thermoresponsive Janus Objects Using Bipolar Electrochemistry
Oranit Phuakkong
Milica Sentic
Haidong Li
Chompunuch Warakulwit
Jumras Limtrakul
Neso Sojic
Alexander Kuhn
Valérie Ravaine
Dodzi Zigah
10.1021/acs.langmuir.6b03040.s001
https://acs.figshare.com/articles/journal_contribution/Wireless_Synthesis_and_Activation_of_Electrochemiluminescent_Thermoresponsive_Janus_Objects_Using_Bipolar_Electrochemistry/4264397
In
this work, bipolar electrochemistry (BPE) is used as a dual
wireless tool to generate and to activate a thermoresponsive electrochemiluminescent
(ECL) Janus object. For the first time, BPE allows regioselective
growth of a poly(<i>N</i>-isopropylacrylamide) (pNIPAM)
hydrogel film on one side of a carbon fiber. It is achieved thanks
to the local reduction of persulfate ions, which initiate radical
polymerization of NIPAM. By controlling the electric field and the
time of the bipolar electrochemical reactions, we are able to control
the length and the thickness of the deposit. The resulting pNIPAM
film is found to be swollen in water at room temperature and collapsed
when heated above 32 °C. We further incorporated a covalently
attached ruthenium complex luminophore, Ru(bpy)<sub>3</sub><sup>2+</sup>, in the hydrogel film. In the second time, BPE is used to activate
remotely the electrogenerated chemiluminescence (ECL) of the Ru(bpy)<sub>3</sub><sup>2+</sup> moieties in the film. We take advantage of the
film responsiveness to amplify the ECL signal. Upon collapse of the
film, the ECL signal, which is sensitive to the distance between adjacent
Ru(bpy)<sub>3</sub><sup>2+</sup> centers, is strongly amplified. It
is therefore shown that BPE is a versatile tool to generate highly
sophisticated materials based on responsive polymers, which could
lead to sensitive sensors.
2016-11-15 00:00:00
Ru
NIPAM
Electrochemiluminescent Thermoresponsive Janus Objects
ECL signal
hydrogel film
bipolar electrochemical reactions
BPE