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Voltammetry: Factors Affecting Measurements

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A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...

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Updated: Sep 8, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Probing Host-Guest Interactions via Conductance and Thermopower Measurements.

Sunil Kumar¹, Dharmraj Prajapati¹, Pooja Singh¹

¹Department of Inorganic and Physical Chemistry, Indian institute of science Bangalore, Bangalore, 560012, India.

Angewandte Chemie (International Ed. in English)

|August 20, 2025

Summary

Encapsulating fullerenes within molecular barrels significantly increases conductance and alters thermoelectric properties. This study explores molecular structure-conductance relationships in host-guest systems for electronic devices.

Keywords:

EGaIn junctions Fullerene Host–guest interactions Supramolecular cage Thermopower

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Area of Science:

Molecular electronics
Supramolecular chemistry
Materials science

Background:

Host-guest interactions are vital for molecular recognition and electronic devices.
Understanding structure-property relationships in molecular systems is crucial.
Charge transport and thermoelectric properties of molecular systems are underexplored.

Purpose of the Study:

To systematically investigate conductance and thermoelectric properties of a molecular barrel (UNMB) and its fullerene-encapsulated derivatives.
To explore the correlation between molecular structure, conductance, and thermoelectric properties.
To elucidate the charge transport mechanism in these systems.

Main Methods:

Conductance measurements using the EGaIn setup.
Thermopower measurements to determine Seebeck coefficients.
Ultraviolet photoelectron spectroscopy (UPS) to analyze energy levels.
Temperature-dependent conductance measurements to study charge transport mechanisms.

Main Results:

Guest-encapsulation (C₆₀⊂UNMB, C₇₀⊂UNMB) increased current density by ~1.5 orders of magnitude compared to pristine UNMB.
Thermopower decreased upon guest-encapsulation, with a positive Seebeck coefficient indicating HOMO-dominated transport.
UPS measurements confirmed a reduction in HOMO energy offset after encapsulation.
Temperature-dependent measurements revealed a thermally activated hopping mechanism for charge transport.

Conclusions:

Fullerene encapsulation strongly modulates the electronic structure and transport properties of the molecular barrel.
The study provides insights into structure-property relationships for molecular electronic devices.
A thermally activated hopping mechanism governs charge transport in these host-guest systems.