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Related Experiment Video

Updated: Jan 11, 2026

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

Published on: October 5, 2017

A Cost-Effective Reference-Less Semiconductor Ion Sensor with Anodic Aluminum Oxide Film.

Yiming Zhong¹, Peng Sun², Zhidong Hou¹

¹State Key Laboratory of Integrated Chips and Systems, College of Integrated Circuits and Micro-Nano Electronics Innovation, Fudan University, Shanghai 200433, China.

Sensors (Basel, Switzerland)

|November 13, 2025

Summary

This summary is machine-generated.

This study introduces a novel reference-less ion sensor (RELESIS) that eliminates bulky electrodes for miniaturized, low-cost applications. The RELESIS demonstrates high pH sensitivity, enabling real-time monitoring of milk freshness.

Keywords:

anodic aluminum oxide pH sensor reference-less

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Published on: November 22, 2016

Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Ion detection is crucial for industrial and biomedical fields.
Traditional ion sensors face limitations like bulkiness, high cost, and poor miniaturization.
Existing sensors require expensive reference electrodes, hindering semiconductor integration.

Purpose of the Study:

To develop a miniaturized, cost-effective, reference-less ion sensor.
To overcome the limitations of traditional ion-sensitive field-effect transistors.
To demonstrate a novel sensor platform for portable ion sensing applications.

Main Methods:

Fabrication of a reference-less semiconductor ion sensor (RELESIS) using anodic aluminum oxide film.
Utilizing a metal-oxide-semiconductor field-effect transistor with an interdigital electrode.
Employing anodic oxidation for low-cost fabrication instead of atomic layer deposition.

Main Results:

The RELESIS device achieved excellent pH sensitivity (57.8 mV/pH) with low hysteresis (7 mV).
Demonstrated real-time, non-destructive monitoring of milk freshness by detecting pH changes.
Successfully eliminated the need for a reference electrode, enabling device miniaturization.

Conclusions:

The RELESIS offers a promising, low-cost, miniaturized solution for ion sensing.
This technology is suitable for next-generation portable systems in food safety, environmental monitoring, and diagnostics.
The reference-less design and superior performance pave the way for advanced point-of-care devices.