Tuning the morphologies and electrical properties of azobenzene-4,4′-dicarboxylate-doped polypyrrole via ultraviolet light irradiation and medium pH alteration

Published on Aug 1, 2019in Polymer3.77
· DOI :10.1016/j.polymer.2019.05.053
Lanbo Shen (SDU: Shandong University), Xirong Huang (SDU: Shandong University)
Abstract In this work, the azobenzene group-containing carboxylic acid salt azobenzene-4,4′-dicarboxylate disodium salt (ADDS) was selected as the dopant for the controlled synthesis of nanostructured polypyrrole (PPy). By controlling the cis - trans configuration of ADDS (via ultraviolet light irradiation) as well as the concentration of divalent ADDS anion (via the medium pH alteration), a series of ADDS-doped PPy hydrogels with different morphologies and electrical properties were prepared accordingly. Under weak alkaline conditions (pH = 8.0), the morphology of the resulting PPy changes from nanofiber (nanobelt) to nanoflake and then to granular structure when the exposure time of ADDS aqueous solution to the UV-light irradiation was extended step by step from 0 to 15 min. This phenomenon is mainly due to the gradual decrease of the trans isomers in ADDS aqueous solution. Under visible light conditions, the morphology of the resulting PPy transforms from nanofiber (nanobelt) to granular structure when the pH of ADDS aqueous solution was varied from pH 8.0 to pH 3.0. This phenomenon is mainly due to the gradual decrease of the divalent doping anions (all trans isomers). Since trans ADDS isomers are co-planar linear molecules, and under weakly alkaline conditions, ADDS exists mainly in the form of divalent anion, the conductivity of PPy doped with all- trans ADDS (10.4 S cm -1 ) is therefore higher than that of PPy doped with UV-light irradiated ADDS (some trans isomers are transformed to the corresponding cis isomers) (1.0 S cm -1 ). It can be concluded that the morphologies and the electrical properties of ADDS-doped polypyrrole conducting hydrogels can be tuned just by varying the UV irradiation time and the medium pH, which results in the change of the steric configuration and the existing form of ADDS. The present new strategy is helpful for the controlled synthesis of conducting polymer hydrogels.
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Published on Jan 1, 2019in Physical Chemistry Chemical Physics3.57
Patrick R. Huddleston6
Estimated H-index: 6
(NTU: Nottingham Trent University),
Victor Volkov8
Estimated H-index: 8
(NTU: Nottingham Trent University),
Carole C. Perry44
Estimated H-index: 44
(NTU: Nottingham Trent University)
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Liang Fei1
Estimated H-index: 1
(Jiangnan University),
Fangqing Ge1
Estimated H-index: 1
(Jiangnan University)
+ 1 AuthorsChaoxia Wang16
Estimated H-index: 16
(Jiangnan University)
Abstract A nonionic photo-responsive surfactant (NPS) was synthesized for obtaining photo control of foamability, exposed in ultraviolet (UV) light or visible (Vis) light irradiation. The foamability depended on the surface activity of NPS, which possessed low critical micelle concentration (CMC) and high adsorption capacity compared with the similar type of nonionic surfactants. The azobenzene component in NPS as the light-responsive group, showed high sensitive and reversibility, i.e., the tra...
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Jinyu Bo1
Estimated H-index: 1
(WIT: Wuhan Institute of Technology),
Xiaofeng Luo1
Estimated H-index: 1
(WIT: Wuhan Institute of Technology)
+ 3 AuthorsXianghua Yu14
Estimated H-index: 14
(WIT: Wuhan Institute of Technology)
Abstract Conducting polypyrrole (PPy) hydrogels are considered as one promising class of materials for high performance supercapacitors because they synergize the unique features of conducting polymers and hydrogels with three-dimensional porous network. PPy hydrogels are synthesized in the absence of any additional crosslinkers by using ammonium persulfate as the oxidizing agent and sodium dodecylsulfonate as the surfactant. The as-prepared hydrogels exhibit nanoparticle-based porous networks w...
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Lanbo Shen1
Estimated H-index: 1
(SDU: Shandong University),
Xirong Huang15
Estimated H-index: 15
(SDU: Shandong University)
Abstract Electrochemical polymerization of aniline in conventional protic ionic liquids (PILs) usually requires an exogenous proton source or the aniline monomer pre-protonation to obtain high quality polyaniline (PANI). In the present work, a proton functionalized ionic liquid pyrrolidinium hydrogenosulfate ([Pyrr][HSO 4 ]), which has high proton activity, has been tried for the first time as an electrolyte for the aniline electropolymerization. It is shown that in this medium the electropolyme...
Published on Nov 1, 2018in Polymer3.77
Yong Ma16
Estimated H-index: 16
(UT: University of Tennessee),
Mingliang Ma1
Estimated H-index: 1
(Qingdao University)
+ 8 AuthorsChao Wang8
Estimated H-index: 8
(North University of China)
Abstract The dimension of polyaniline (PANI) is effectively tuned by changing the end groups of additive surfactants. PANI fiberboards, dendrites, and rods are separately obtained through the guidance of micelle soft templates formed by the corresponding surfactants, i.e., sodium dodecyl sulfonate (SDS), sodium lauryl sulfonate (SLS), and sodium dodecyl benzene sulfonate (SDBS). Detailed mechanistic studies reveal that PANI structures are fabricated from a bottom-up self-assembly process where o...
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Feixue Zou1
Estimated H-index: 1
(Qilu University of Technology),
Xirong Huang1
Estimated H-index: 1
(SDU: Shandong University)
Novel proton-functionalized solid anilinium salts (anilinium hydrochloride ([HANI]Cl) and anilinium nitrate ([HANI]NO3)) are synthesized. Simply mixing proton-functionalized anilinium salt with glycol in appropriate ratios can get deep eutectic solvents (DESs) which are liquid at room temperature. DES system is a new type of ionic liquids (ILs) or IL analogs. Tests show that the resulting DES systems have higher conductivity and lower viscosity which are suitable for electropolymerization. The e...
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Yi He5
Estimated H-index: 5
Xia Yang17
Estimated H-index: 17
+ 1 AuthorsYaqin Chai56
Estimated H-index: 56
Usually, SERS technology requires labeling of the Raman reporter to obtain characteristic spectra for detection of biological samples. However, the number of labeled Raman reporters is often limited, resulting in the restricted improvement for sensitivity of SERS biosensor. In this work, switchable target-responsive 3D DNA hydrogels were introduced to precisely control trapping and release of Raman reporter toluidine blue (TB), which not only avoid labeling signal molecule but also improve the s...
Published on Jul 18, 2017in Accounts of Chemical Research21.66
Fei Zhao27
Estimated H-index: 27
Ye Shi23
Estimated H-index: 23
+ 1 AuthorsGuihua Yu12
Estimated H-index: 12
ConspectusConductive polymers have attracted significant interest over the past few decades because they synergize the advantageous features of conventional polymeric materials and organic conductors. With rationally designed nanostructures, conductive polymers can further exhibit exceptional mechanical, electrical, and optical properties because of their confined dimensions at the nanoscale level. Among various nanostructured conductive polymers, conductive polymer gels (CPGs) with syntheticall...
Published on Mar 1, 2017in Polymer3.77
Irina Sapurina33
Estimated H-index: 33
(CAS: Academy of Sciences of the Czech Republic),
Yu Li10
Estimated H-index: 10
(CAS: Academy of Sciences of the Czech Republic)
+ 4 AuthorsJaroslav Stejskal59
Estimated H-index: 59
(CAS: Academy of Sciences of the Czech Republic)
Abstract Polypyrrole nanotubes rank among important functional materials with high application potential. They are prepared by the oxidative polymerization of pyrrole usually in the presence of methyl orange and represent conducting polymers with the highest bulk conductivity, 40–50 S cm −1 . The role of methyl orange in promoting the nanotubular morphology of polypyrrole is discussed on the basis of FTIR and Raman spectra. The model based on the organization of acid form of methyl orange molecu...
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Marina Porcher1
Estimated H-index: 1
(François Rabelais University),
Charles Esnault1
Estimated H-index: 1
(François Rabelais University)
+ 1 AuthorsFouad Ghamouss10
Estimated H-index: 10
(François Rabelais University)
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