PH measurements with ZnO based surface acoustic wave resonator

Xiaotun Qiu; Rui Tang; Shih Jui Chen; Hao Zhang; Wei Pang; Hongyu Yu

doi:10.1016/j.elecom.2011.02.028

PH measurements with ZnO based surface acoustic wave resonator

Xiaotun Qiu, Rui Tang, Shih Jui Chen, Hao Zhang, Wei Pang, Hongyu Yu

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

17 Scopus citations

Abstract

This paper investigated pH measurements using ZnO based surface acoustic wave resonator (SAW). The resonant frequency of the SAW decreased as pH value changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H ₃O⁺) or hydroxide (OH^-) and ZnO was proposed to be responsible for the frequency drop. Both hydronium and hydroxide can increase the conductivity of the ZnO film, resulting in the resonant frequency decrease due to the acoustoelectric effect.

Original language	English (US)
Pages (from-to)	488-490
Number of pages	3
Journal	Electrochemistry Communications
Volume	13
Issue number	5
DOIs	https://doi.org/10.1016/j.elecom.2011.02.028
State	Published - May 2011

Keywords

Acoustoelectric effect
Surface acoustic wave resonator
ZnO
pH

ASJC Scopus subject areas

Electrochemistry

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10.1016/j.elecom.2011.02.028

Cite this

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title = "PH measurements with ZnO based surface acoustic wave resonator",

abstract = "This paper investigated pH measurements using ZnO based surface acoustic wave resonator (SAW). The resonant frequency of the SAW decreased as pH value changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H 3O+) or hydroxide (OH-) and ZnO was proposed to be responsible for the frequency drop. Both hydronium and hydroxide can increase the conductivity of the ZnO film, resulting in the resonant frequency decrease due to the acoustoelectric effect.",

keywords = "Acoustoelectric effect, Surface acoustic wave resonator, ZnO, pH",

author = "Xiaotun Qiu and Rui Tang and Chen, {Shih Jui} and Hao Zhang and Wei Pang and Hongyu Yu",

note = "Funding Information: We would like to thank Dr. Eun Sok Kim at University of Southern California for providing ZnO films. This work was supported by NASA Astrobiology Institute and ASU graduate dissertation fellowship .",

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doi = "10.1016/j.elecom.2011.02.028",

language = "English (US)",

volume = "13",

pages = "488--490",

journal = "Electrochemistry Communications",

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TY - JOUR

T1 - PH measurements with ZnO based surface acoustic wave resonator

AU - Qiu, Xiaotun

AU - Tang, Rui

AU - Chen, Shih Jui

AU - Zhang, Hao

AU - Pang, Wei

AU - Yu, Hongyu

N1 - Funding Information: We would like to thank Dr. Eun Sok Kim at University of Southern California for providing ZnO films. This work was supported by NASA Astrobiology Institute and ASU graduate dissertation fellowship .

PY - 2011/5

Y1 - 2011/5

N2 - This paper investigated pH measurements using ZnO based surface acoustic wave resonator (SAW). The resonant frequency of the SAW decreased as pH value changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H 3O+) or hydroxide (OH-) and ZnO was proposed to be responsible for the frequency drop. Both hydronium and hydroxide can increase the conductivity of the ZnO film, resulting in the resonant frequency decrease due to the acoustoelectric effect.

AB - This paper investigated pH measurements using ZnO based surface acoustic wave resonator (SAW). The resonant frequency of the SAW decreased as pH value changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H 3O+) or hydroxide (OH-) and ZnO was proposed to be responsible for the frequency drop. Both hydronium and hydroxide can increase the conductivity of the ZnO film, resulting in the resonant frequency decrease due to the acoustoelectric effect.

KW - Acoustoelectric effect

KW - Surface acoustic wave resonator

KW - ZnO

KW - pH

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DO - 10.1016/j.elecom.2011.02.028

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SN - 1388-2481

VL - 13

SP - 488

EP - 490

JO - Electrochemistry Communications

JF - Electrochemistry Communications

IS - 5

ER -

PH measurements with ZnO based surface acoustic wave resonator

Abstract

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