Charge transfer effect in the polyaniline-gold nanoparticle memory system

Abstract

A composite system comprised of polyaniline nanofibers bonded with gold nanoparticles is shown to possess a memory effect via a charge transfer mechanism. The charge transfer occurs between the imine nitrogen in the polyaniline and the gold nanoparticles as confirmed by x-ray photoelectron spectroscopy and Raman spectroscopy. This charge transfer enables a bistable electrical conductivity, allowing the material system to be used as a digital memory device. The charge transfer is further confirmed by the elimination of the conductance switching when the fully reduced form of polyaniline, leucoemeraldine, which possesses no imine nitrogens, is used in place of the emeraldine form.

Nanostructured CaWO4, CaWO4:Eu3+ and CaWO4:Tb3+ Particles: Sonochemical Synthesis and Luminescent Properties

“…The formation of AuNPs-PANI composite has been known to result in fast charge transfer effect and the charge transfer induced conductance switching due to partial transfer of electron clouds at the conjugate C N bond to gold nanoparticles via ionic interactions between negatively charged citrate capped gold nanoparticles and positively charged species of PANI. 28 The observed shift in oxidation peak potential in the present studies is attributed to such transfer of electron cloud from PANI to gold nanoparticles and require higher energy to remove an electron from the PANI film to form polarons. The cyclic voltammogramme (Fig.…”

“…27 The composite of AuNPs-PANI exhibits both charge transfer effect and charge transfer induced conductance switching suitable for memory device. 28 However, composite of AuNPs-PANI system for biosensing has not yet much investigated.…”

Hybrid Veil-Like Co(OH)2/rGO Nanocomposites Towards Electrochemical Hydrogen Storage Properties

“…1(c) shows two prominent peaks located at À1360 cm À1 (D-band), À1595 cm À1 (G-band), which correspond to breathing modes of rings and the E 2g phonon of sp 2 -bonded carbon atoms in the two-dimensional hexagonal lattice. 28,29 Compared with rGO, three new distinct peaks located at 471 cm À1 , 523 cm À1 and 678 cm À1 appear, which can be assigned to OCo-O bending mode, Co-O stretching mode, and the A 1g mode of the Co(OH) 2 crystalline phase, respectively. 30,31 It is well known that the intensity ratio of D to G band (I D =I G Þ is generally accepted as re°ections of the defect density for carbonaceous materials.…”

Nitrogen-Doped Hollow Carbon Nanospheres Derived from Dopamine as High-Performance Anode Materials for Sodium-Ion Batteries

“…The absorption peaks at around 1649 cm À1 , 1109 cm À1 and 802 cm À1 may be assigned to SiO 2 . 18,19 Furthermore, the morphology and microstructure of the as-prepared N-HCS are identi¯ed by SEM and TEM measurements. Observation from the SEM image in Fig.…”