P-EcStat: A Versatile Design of Photoelectrochemical and Electrochemical Sensing System with Smartphone Interface via Bluetooth Low Energy

Author:

Huynh Vo Anh Hao12ORCID,Tran Viet Cuong3ORCID,Tran Trung Tin124ORCID,Nguyen Thien Trang12ORCID,Nguyen Anh Duong12ORCID,Huynh Tran My Hoa3ORCID,Tran Trung Nghia12ORCID

Affiliation:

1. Laboratory of Laser Technology, Faculty of Applied Science, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 72409, Vietnam

2. Vietnam National University Ho Chi Minh City (VNUHCM), Linh Trung Ward, Thu Duc, Ho Chi Minh City 71308, Vietnam

3. VKTECH Research Center, NTT Hi-Tech Institute, Nguyen Tat Thanh University, 298-300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City 72820, Vietnam

4. Faculty of Physics and Physics Engineering, University of Science, VNUHCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 72711, Vietnam

Abstract

Electrochemical and photoelectrochemical sensors are a rapidly developing field in analytical chemistry. However, commercial systems often lack versatility and affordability, hindering wider adoption. Additionally, the absence of integrated excitation light sources limits their application in photoelectrochemical sensing. Here, we present a highly precise, versatile, affordable measurement system for both electrochemical and photoelectrochemical sensing applications. The system incorporates a three-electrode potentiostat with a synchronized excitation light source. This design enables the system to perform conventional electrochemical measurements like cyclic voltammetry, chronoamperometry, and photoelectrochemical amperometric measurements with controlled light excitation. The developed measurement system operates within a voltage range suitable for a measurable current range of 1 nA to 18 mA, with a high precision of 99%. The excitation source is a monochromatic LED system offering seven distinct wavelengths with digitally controlled intensity via a digital-to-analog converter. Furthermore, an Android-based user interface allows wireless system control via Bluetooth Low Energy. The report also details the construction of a photoelectrochemical experiment using copper (II) oxide nanorods synthesized by the hydrothermal process as the photoactive material employed to test the experiment on a potassium ferricyanide/potassium ferrocyanide solution. This user-friendly system allows broader exploration of electrochemical and photoelectrochemical sensing applications.

Funder

Vietnam National University Ho Chi Minh City

Publisher

MDPI AG

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