Bisphenol A Sensors on Polyimide Fabricated by Laser Direct Writing for Onsite River Water Monitoring at Attomolar Concentration

Cheng Cheng, Shutong Wang, Jayne Wu, Yongchao Yu, Ruozhou Li, Shigetoshi Eda, Jiangang Chen, Guoying Feng, Benjamin Lawrie, Anming Hu

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

This work presents an aptamer-based, highly sensitive and specific sensor for atto- to femtomolar level detection of bisphenol A (BPA). Because of its widespread use in numerous products, BPA enters surface water from effluent discharges during its manufacture, use, and from waste landfill sites throughout the world. On-site measurement of BPA concentrations in water is important for evaluating compliance with water quality standards or environmental risk levels of the harmful compound in the environment. The sensor in this work is porous, conducting, interdigitated electrodes that are formed by laser-induced carbonization of flexible polyimide sheets. BPA-specific aptamer is immobilized on the electrodes as the probe, and its binding with BPA at the electrode surface is detected by capacitive sensing. The binding process is aided by ac electroosmotic effect that accelerates the transport of BPA molecules to the nanoporous graphene-like structured electrodes. The sensor achieved a limit of detection of 58.28 aM with a response time of 20 s. The sensor is further applied for recovery analysis of BPA spiked in surface water. This work provides an affordable platform for highly sensitive, real time, and field-deployable BPA surveillance critical to the evaluation of the ecological impact of BPA exposure.

Original languageEnglish
Pages (from-to)17784-17792
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number28
DOIs
StatePublished - Jul 20 2016

Keywords

  • ac electroosmosis
  • aptasensor
  • capacitive sensing
  • laser direct writing
  • point of care

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