skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multifunctional Nanostructured Conductive Polymer Gels: Synthesis, Properties, and Applications

 [1];  [1];  [2]; ORCiD logo [1]
  1. Materials Science and Engineering Program and Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
  2. Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
Grant/Contract Number:
Resource Type:
Journal Article: Published Article
Journal Name:
Accounts of Chemical Research
Additional Journal Information:
Journal Volume: 50; Journal Issue: 7; Related Information: CHORUS Timestamp: 2017-11-27 08:07:31; Journal ID: ISSN 0001-4842
American Chemical Society
Country of Publication:
United States

Citation Formats

Zhao, Fei, Shi, Ye, Pan, Lijia, and Yu, Guihua. Multifunctional Nanostructured Conductive Polymer Gels: Synthesis, Properties, and Applications. United States: N. p., 2017. Web. doi:10.1021/acs.accounts.7b00191.
Zhao, Fei, Shi, Ye, Pan, Lijia, & Yu, Guihua. Multifunctional Nanostructured Conductive Polymer Gels: Synthesis, Properties, and Applications. United States. doi:10.1021/acs.accounts.7b00191.
Zhao, Fei, Shi, Ye, Pan, Lijia, and Yu, Guihua. 2017. "Multifunctional Nanostructured Conductive Polymer Gels: Synthesis, Properties, and Applications". United States. doi:10.1021/acs.accounts.7b00191.
title = {Multifunctional Nanostructured Conductive Polymer Gels: Synthesis, Properties, and Applications},
author = {Zhao, Fei and Shi, Ye and Pan, Lijia and Yu, Guihua},
abstractNote = {},
doi = {10.1021/acs.accounts.7b00191},
journal = {Accounts of Chemical Research},
number = 7,
volume = 50,
place = {United States},
year = 2017,
month = 6

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acs.accounts.7b00191

Save / Share:
  • The synthesis and characterization of lead telluride (PbTe) gels and aerogels with nanostructured features of potential benefit for enhanced thermoelectrics is reported. In this approach, discrete thiolate-capped PbTe nanoparticles were synthesized by a solution-based approach followed by oxidation-induced nanoparticle assembly with tetranitromethane or hydrogen peroxide to form wet gels. Drying of the wet gels by supercritical CO₂ extraction yielded aerogels, whereas xerogels were produced by ambient pressure bench top drying. The gels consist of an interconnected network of colloidal nanoparticles and pores with surface areas up to 74 m² g -1. The thermal stability of the nanostructures relative to nanoparticlesmore » was probed with the help of in situ transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The aerogels were observed to sublime at a higher temperature and over a larger range (425–500 °C) relative to the precursor nanoparticles. TGA-DSC suggests that organic capping groups can be removed in the region 250–450 °C, and melting of PbTe nanoparticles occurs near the temperature for bulk materials (ca. 920 °C). The good thermal stability combined with the presence of nanoscale interfaces suggests PbTe gels may show promise in thermoelectric devices.« less
  • Highlights: • SrSi{sub 2}O{sub 2}N{sub 2}: Eu{sup 2+} phosphor was prepared by polymer metal complex (pechini method). • The annealing time was decreased from 6 h in solid state method to 3 h. • The particles are crystalline and dispersed well with average size 6.5 μm. - Abstract: Green emitting Sr{sub (1−x)}Si{sub 2}O{sub 2}N{sub 2}: xEu{sup 2+} (x = 0, 0.02, 0.04, 0.06, 0.08 and 0.1) phosphors were synthesized by polymer metal complex or pechini method. The XRD results confirm the formation of a pure phase at 1400 °C for 3 h. The SEM and particles size results indicate thatmore » the prepared phosphor consists of a polyhedral crystalline shape with well dispersed and the average particle size around 6.5 μm. The maximum PL intensity was found at 0.04% Eu{sup 2+} with a wide emission band between 460 and 640 nm and a green emission peak at 531.4 nm. The external quantum efficiency of 0.04% Eu{sup 2+} sample was 43.13%. The results indicate that pechini method is an alternative way and close in efficiency to the solid state method to prepare SrSi{sub 2}O{sub 2}N{sub 2} phosphor with higher homogeneity and more uniform size distribution for near UV and blue region applications for white light emitting diodes WLEDs.« less
  • Polymer-containing silicate gels were hydrothermally crystallized to form layered magnesium silicate hectorite clays containing polymers that are incorporated in situ. Gels consist of silica sol, magnesium hydroxide sol, lithium fluoride, and the polymer of choice. Dilute solutions of gel in water are refluxed for various lengths of time and then isolated via centrifugation, washed, and air-dried. Polymer loadings up to 86% were attained by adding more polymer to the solutions after 2-day reaction times, reacting for another 24 h, and continuing this process prior to isolation. Polyaniline (PANI)- and polyacrylonitrile (PACN)-clay samples contain up to 57% and 76% polymer, respectively,more » after just one sequential addition at high polymer loading. Series of PANI-, PACN-, poly(vinylpyrrolidone) (PVP)-, and hydroxypropylmethylcellulose (HPMC)-clays also were prepared by several sequential additions of lower polymer loading to the silicate gel during crystallization. Final polymer loadings were determined by thermal analysis. Basal spacings between clay interlayers were measured by X-ray powder diffraction for all samples. Increases in polymer loadings and basal spacings were observed for all the neutral polymers studied, until or unless delamination occurred. Delamination was evident for PACN- and PANI-clay nanocomposites. The highest loadings were observed for the PACN-clays, up to 86%. For the cationic polymer polydimethyldiallylammonium chloride, however, the loading could not be increased beyond about 20%. This is due to electrostatic interactions that balance the negatively charged sites on the silicate lattice with those on the cationic polymer chain. Beyond charge compensation, there is no driving force for further incorporation. Charge compensation in the case of the neutral polymers is attained by interlayer lithium(I) cations.« less