Vanadium Oxide/Polypyrrole Aerogel Nanocomposites

Electrically conductive oxide aerogels: new materials in electrochemistry

“…With the aerogel materials, the objective is to attain two interpenetrating networks: V 2 O 5 to achieve lithium intercalation and the conducting polymer to provide an electronically conducting network. 119,152 This approach would circumvent the need to add carbon to electrode structures because of the low electronic conductivity of the transition metal oxide. A key feature in designing this hybrid material is the need to have a homogeneous distribution of the conducting polymer so that good access to the vanadium oxide phase is achieved.…”

“…One approach is a cosynthesis route where the organic and inorganic networks are polymerized simultaneously from a common solvent. [152][153][154] The second approach involves sequential polymerization of each component; V 2 O 5 Fig. 10 The impedance of a mixed-phase RuO 2 -TiO 2 aerogel depends on the partial pressure of water and oxygen in the bathing atmosphere, which indicates that mixed electron and proton conductivity occurs in this nanoscale mesoporous material.…”

A Combinatorial Approach for the Synthesis and Characterization of Polymer/Vanadium Oxide Nanocomposites

“…13 Both the V-O-V γ sym and γ asym modes in the composite shift to higher wavenumbers (from 767 to 784 cm -1 and from 526 to 543 cm -1 , respectively), compared to the pure inorganic V 2 O 5 and implying the interaction between polymer and V 2 O 5 , and a reduced V-O-V bond length was proposed. 13 In addition, all three bands exhibited decreasing absorbances because of the existence of polymer in PEP/ V 2 O 5 nanocomposites. Table 3 lists the details of infrared mode frequencies and assignments for V 2 O 5 , PEP, and V 2 O 5 / PEP composites (5 wt % and 30 wt %, respectively).…”

“…Comparing the spectra of the composite, pure polymer and V 2 O 5 , it was observed that the γ V  O (Figure d) shifts up from 981 cm -1 in V 2 O 5 to 1004 cm -1 in PEP(30 wt %)/V 2 O 5 composites (Figure b), implying the incorporation of polymer to V 2 O 5 . Therefore the vibrational frequency of VO is anticipated to increase, probably due to the strengthened VO bond resulting from the interaction between polymer and V 2 O 5 . Both the V−O−V γ sym and γ asym modes in the composite shift to higher wavenumbers (from 767 to 784 cm -1 and from 526 to 543 cm -1 , respectively), compared to the pure inorganic V 2 O 5 and implying the interaction between polymer and V 2 O 5 , and a reduced V−O−V bond length was proposed .…”

“…Polymer/V 2 O 5 xerogel nanocomposites, e.g., polyaniline/V 2 O 5 and polypyrrole/V 2 O 5 , have been reported and exhibited improved conductivity compared to pristine V 2 O 5 xerogels. , Here we represent a combinatorial approach toward the rapid screening of polyphenol/V 2 O 5 nanocomposite materials for their optical properties. The enzymatic synthesis of polyphenols carried out under ambient conditions has recently been reported .…”