A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection

Qingyuan Liu; Jungyoon Kim; Tianhong Cui

doi:10.1109/MEMS46641.2020.9056346

A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection

Qingyuan Liu, Jungyoon Kim, Tianhong Cui

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Scopus citations

Abstract

This paper presents a photoelectrochemical (PEC) sensor using flexible polymer as the substrate for detection of hexavalent chromium (Cr(VI)) ions, showing a large sensing range from part per billion (ppb) level to part per million (ppm) level. This sensor utilizes layer-by-layer (LbL) self-assembled graphene intercalation to mediate the Schottky barrier formed between the metal electrodes (Au) and the photon-sensitive material (titanium dioxide, TiO₂), which enhances the photocurrent of the sensor more than three times. Additionally, graphene layer also improves the stability of the sensing signal (photocurrent) due to its role in facilitating the separation of photon-excited electrons and holes. Quercetin is used as the selective material in the sensing system, which can specifically interact with Cr(VI). The flexibility of metal electrode and nanomaterial films of the sensor allows the adoption of a flexible substrate, with great application potential in wearable or implantable sensors for animals and plants. The sensor shows a detection range from 14.9 to 3194.1 ppb in dissolved air, with a low detection limit of 9.5 ppb.

Original language	English (US)
Title of host publication	33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	701-704
Number of pages	4
ISBN (Electronic)	9781728135809
DOIs	https://doi.org/10.1109/MEMS46641.2020.9056346
State	Published - Jan 2020
Event	33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020 - Vancouver, Canada Duration: Jan 18 2020 → Jan 22 2020

Publication series

Name	Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)
Volume	2020-January
ISSN (Print)	1084-6999

Conference

Conference	33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020
Country/Territory	Canada
City	Vancouver
Period	1/18/20 → 1/22/20

Bibliographical note

Funding Information:
Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award Number ECCS-1542202.

Publisher Copyright:
© 2020 IEEE.

Keywords

Photoelectrochemical sensor
TiO nanoparticle
flexible substrate
graphene
hexavalent chromium

Publisher link

10.1109/MEMS46641.2020.9056346

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Liu, Q., Kim, J., & Cui, T. (2020). A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection. In 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020 (pp. 701-704). Article 9056346 (Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS); Vol. 2020-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MEMS46641.2020.9056346

A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection. / Liu, Qingyuan; Kim, Jungyoon; Cui, Tianhong.
33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020. Institute of Electrical and Electronics Engineers Inc., 2020. p. 701-704 9056346 (Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS); Vol. 2020-January).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Liu, Q, Kim, J & Cui, T 2020, A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection. in 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020., 9056346, Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), vol. 2020-January, Institute of Electrical and Electronics Engineers Inc., pp. 701-704, 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020, Vancouver, Canada, 1/18/20. https://doi.org/10.1109/MEMS46641.2020.9056346

Liu Q, Kim J, Cui T. A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection. In 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020. Institute of Electrical and Electronics Engineers Inc. 2020. p. 701-704. 9056346. (Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)). doi: 10.1109/MEMS46641.2020.9056346

Liu, Qingyuan ; Kim, Jungyoon ; Cui, Tianhong. / A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection. 33rd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2020. Institute of Electrical and Electronics Engineers Inc., 2020. pp. 701-704 (Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)).

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abstract = "This paper presents a photoelectrochemical (PEC) sensor using flexible polymer as the substrate for detection of hexavalent chromium (Cr(VI)) ions, showing a large sensing range from part per billion (ppb) level to part per million (ppm) level. This sensor utilizes layer-by-layer (LbL) self-assembled graphene intercalation to mediate the Schottky barrier formed between the metal electrodes (Au) and the photon-sensitive material (titanium dioxide, TiO2), which enhances the photocurrent of the sensor more than three times. Additionally, graphene layer also improves the stability of the sensing signal (photocurrent) due to its role in facilitating the separation of photon-excited electrons and holes. Quercetin is used as the selective material in the sensing system, which can specifically interact with Cr(VI). The flexibility of metal electrode and nanomaterial films of the sensor allows the adoption of a flexible substrate, with great application potential in wearable or implantable sensors for animals and plants. The sensor shows a detection range from 14.9 to 3194.1 ppb in dissolved air, with a low detection limit of 9.5 ppb.",

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AB - This paper presents a photoelectrochemical (PEC) sensor using flexible polymer as the substrate for detection of hexavalent chromium (Cr(VI)) ions, showing a large sensing range from part per billion (ppb) level to part per million (ppm) level. This sensor utilizes layer-by-layer (LbL) self-assembled graphene intercalation to mediate the Schottky barrier formed between the metal electrodes (Au) and the photon-sensitive material (titanium dioxide, TiO2), which enhances the photocurrent of the sensor more than three times. Additionally, graphene layer also improves the stability of the sensing signal (photocurrent) due to its role in facilitating the separation of photon-excited electrons and holes. Quercetin is used as the selective material in the sensing system, which can specifically interact with Cr(VI). The flexibility of metal electrode and nanomaterial films of the sensor allows the adoption of a flexible substrate, with great application potential in wearable or implantable sensors for animals and plants. The sensor shows a detection range from 14.9 to 3194.1 ppb in dissolved air, with a low detection limit of 9.5 ppb.

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A Flexible Photoelectrochemical Sensor for Hexavalent Chromium Detection

Abstract

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