Thickness-dependent sensitivity of Copper Phthalocyanine chemiresistive Nitrogen Dioxide sensors

Chia, Liping Sharon; Suresh, Palaniswamy; Lee, Pooi See

doi:10.1109/icsens.2016.7808405

Cited by 1 publication

(1 citation statement)

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“…The main differences between these layers lie in bigger grains and higher crystallinity of the thicker layer, which is in agreement with previous works carried out in studying Pc layers of different thicknesses. 39,40 However, given that the differences between the two CuPc layers are less than two times, it is assumed that XAS measurements taken with 200 nm CuPc layer would be similar for 100 nm CuPc layer.…”

Section: Resultsmentioning

confidence: 99%

Interaction of Copper Phthalocyanine with Nitrogen Dioxide and Ammonia Investigation Using X-ray Absorption Spectroscopy and Chemiresistive Gas Measurements

Chia

Suresh³

et al. 2019

ACS Omega

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The interaction site of phthalocyanine (Pc) with nitrogen dioxide (NO 2 ) has been characterized using different methods and found to be conflicting. By knowing the interaction site, the Pc molecule can be better customized to improve the gas sensitivity. In this article, the interaction sites of copper phthalocyanine (CuPc) with oxidizing NO 2 or with reducing gas (ammonia, NH 3 ) were identified using in situ X-ray absorption spectroscopy (XAS). The sensitivity of CuPc to sub-ppm levels of the tested gases was established in the CuPc chemoresistive gas sensors. The analyte–sensor interaction sites were identified and validated by monitoring the Cu K-edge XAS before and during gas exposure. From the X-ray absorption near-edge structure and its first derivative, a low or lack of axial coordination on the Cu metal center of CuPc is evident. Using the extended X-ray absorption fine structure with molecular orbital information of the involved molecules, the macrocycle interaction between CuPc and NO 2 or NH 3 was proposed to be the dominant sensing mechanism on CuPc sensors.

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Section: Resultsmentioning

confidence: 99%