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Atiweena Krittayavathananon

Atiweena Krittayavathananon

University of Oxford, UK

Title: Improving single carbon nanotube electrode contacts using molecular electronics

Biography

Atiweena Krittayavathananon PhD has her expertise in Applied Electrochemistry, Electro-Analysis and Functional Materials. After years of experience in the research, she found new pathways for observing aggregation of 2D materials in colloids and suspensions using an electrochemical “nano-impacts” based on bridging impacts. The “nano-impacts” has proved to be an effective approach for investigating single nanoparticle behavior in solution phase. By using this technique, she creates a simple idea for minimizing contact resistance between catalysts and supporting electrode in the solution phase as presented in her talk.     

 

Abstract

Carbon nanotubes (CNTs) and their derivatives are commonly applied as both catalyst supports and catalysts in many electronic devices. To achieve high-performance electronics, researchers have focused intensive efforts into developing the chemical and physical properties of new materials but largely ignore the potentially fundamental problem of forming a high-quality contact with the electrochemical substrate. When two materials are brought into contact, the junction causes a potential drop in the system resulting from a contact resistance. To understand the junction properties of metal/CNT interfaces, the nano-impact methodology has been developed as a route to measuring the resistance across individual CNT−electrode contacts. In these experiments, some of the CNTs in the solution phase form a bridge across two adjacent gold electrode contacts. An average bridging resistance for individual CNTs contact is 1.1±0.1×108 Ω. To improve the CNT-Au contact, we report the use of an electroactive species, acetaminophen, to modify the electrical connection between a carbon nanotube (CNT) and an electrode. By measuring the current signal across the bridge of single acetaminophen-modified CNT contact between the two microbands of the IDE-Au, the current response of acetaminophen modified on CNT is significant higher than the bare CNT, indicating that the electronic properties of the single CNT-Au contact are improved by modifying CNT with acetaminophen. It investigates that the adsorbed acetaminophen molecules contribute to promoting the electron transfer processes between the junctions of two materials.