Nanoparticle and Sol -Gel Inks for Direct -Write Assembly of Functional Metallic and Metal Oxide Materials

Duoss, Eric Brian

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Description

Title

Nanoparticle and Sol -Gel Inks for Direct -Write Assembly of Functional Metallic and Metal Oxide Materials

Author(s)

Duoss, Eric Brian

Issue Date

2009

Doctoral Committee Chair(s)

Lewis, Jennifer A.

Department of Study

Materials Science and Engineering

Discipline

Materials Science and Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Engineering, Materials Science

Language

eng

Abstract

The ability to pattern 1D arrays of TiO2 microwires offers precise control of filament diameter and spatial location, enabling a systematic study of microwire TiO2 gas sensors. A model gas sensor consisting of a single layer of parallel microwires is printed with the TiO2-based sol-gel ink in a well-defined, programmable pattern. The as-printed structure is heat treated in air to 600°C to form anatase TiO2. After heat treatment, the TiO2 wire diameter is measured as (628 +/- 13 nm). Gas sensing measurements on the TiO2 microwire array performed at elevated temperatures (200--300°C) indicate high sensitivity towards NO2 and CO gases, with estimated sensitivity limits in the sub-ppm range for NO2 and single ppm range for CO. Under ambient conditions, the TiO2 microwire array responds quite significantly and reversibly to low NO2 concentrations (down to 0.5 ppm). This is a highly promising result for the creation of low-power, gas sensor devices based upon direct-write assembled TiO2 microwire arrays.

Graduation Semester

2009

Type of Resource

text

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http://hdl.handle.net/2142/82841

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