Abstract

The detection and discrimination of organic acids (OAs) is of great importance in the early diagnosis of specific diseases. In this study, we established an effective visual sensor array for the identification of OA. This is the first time, to our best knowledge, that metal ions were used to regulate the etching of silver triangular nanoprisms (AgTNPs) in an OA discrimination sensor array. The sensor array was based on the oxidation etching of AgTNPs by three metal ions (${{\rm Mn}^{2 +}}$, ${{\rm Pb}^{2 +}}$, and ${{\rm Cr}^{3 +}}$) and accelerated etching of AgTNPs by OA. The introduction of metal ions alone led to a slight wavelength shift of the AgTNPs colloid solution, signifying the incomplete etching of the AgTNPs. Nevertheless, when metal ions and OA were introduced simultaneously to the solution, a significant blueshift of the localized surface plasmon resonance peak was detected, and a color change of the AgTNPs was observed, which were the consequences of morphological transitions of the AgTNPs. The addition of different OA accelerated AgTNPs etching in varying degrees, generating diverse colorimetric response patterns (i.e., RGB variations) as “fingerprints” associated with each specific organic acid. Pattern recognition algorithms and neural network simulation were employed to further data analysis, indicating the outstanding discrimination capability of the provided array for eight OA at the 33 µM level. Moreover, excellent results of selective experiments as well as real samples tests demonstrate that our proposed method possesses great potential for practical applications.

© 2022 Optica Publishing Group

Fabrication of microgrooves in PMN-PT using femtosecond laser irradiation and acid etching

Tianlun Shen, Jinhai Si, Tao Chen, Yongyong Zhuang, and Xun Hou
Appl. Opt. 61(21) 6234-6240 (2022)

Adaptive neuro fuzzy selection of important factors for prediction of plasmons in silver nanorods

Dalibor Petković, Mohamed Amine Khadimallah, Yan Cao, Nebojsa Denic, Vuk Vujovic, Dragan Zlatkovic, and Jelena Stojanovic
Appl. Opt. 61(10) 2864-2868 (2022)

Enhancing the sensing behavior of a reduced graphene magnetite-based plasmonic optical fiber sensor

Ali Abdulkhaleq Alwahib, Mohammed A. Saleh, and Mohammed Jalal Abdulrazzaq
Appl. Opt. 61(21) 6110-6118 (2022)

Influence of ion-beam etching by Ar ions with an energy of 200–1000 eV on the roughness and sputtering yield of a single-crystal silicon surface

M. S. Mikhailenko, A. E. Pestov, N. I. Chkhalo, M. V. Zorina, A. K. Chernyshev, N. N. Salashchenko, and I. I. Kuznetsov
Appl. Opt. 61(10) 2825-2833 (2022)

In-fiber Mach-Zehnder interferometer based on hollow optic fiber for metal ion detection

Ming-Fu Liu, Jia-Wei Wang, and Shug-June Hwang
Opt. Express 30(15) 26006-26017 (2022)