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Title: A differential dielectric spectroscopy setup to measure the electric dipole moment and net charge of colloidal quantum dots

A sensitive dielectric spectroscopy setup is built to measure the response of nanoparticles dispersed in a liquid to an alternating electric field over a frequency range from 10{sup −2} to 10{sup 7} Hz. The measured complex permittivity spectrum records both the rotational dynamics due to a permanent electric dipole moment and the translational dynamics due to net charges. The setup consists of a half-transparent capacitor connected in a bridge circuit, which is balanced on pure solvent only, using a software-controlled compensating voltage. In this way, the measured signal is dominated by the contributions of the nanoparticles rather than by the solvent. We demonstrate the performance of the setup with measurements on a dispersion of colloidal CdSe quantum dots in the apolar liquid decalin.
Authors:
; ; ;  [1]
  1. Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht (Netherlands)
Publication Date:
OSTI Identifier:
22254990
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CADMIUM SELENIDES; COMPUTER CODES; DECALIN; DIELECTRIC MATERIALS; DISPERSIONS; ELECTRIC DIPOLE MOMENTS; ELECTRIC FIELDS; ELECTRIC POTENTIAL; FREQUENCY RANGE; PERFORMANCE; PERMITTIVITY; QUANTUM DOTS; SOLVENTS; SPECTROSCOPY