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

R. J. Kortschot; I. A. Bakelaar; B. H. Erné; B. W M Kuipers

doi:10.1063/1.4867666

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

R. J. Kortschot, I. A. Bakelaar, B. H. Erné, B. W M Kuipers^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

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^-2 to 10⁷ 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.

Original language	English
Article number	033903
Journal	Review of Scientific Instruments
Volume	85
Issue number	3
DOIs	https://doi.org/10.1063/1.4867666
Publication status	Published - 1 Jan 2014

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abstract = "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 10-2 to 107 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.",

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

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