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Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

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Mesoporous polydopamine microspheres for rapid ppb-level ultra-sensitive formaldehyde detection.

Luyu Wang¹, Jia Song², Chunyang Yu³

¹College of Artificial Intelligence and E-Commerce, Zhejiang Gongshang University Hangzhou College of Commerce, Hangzhou, 311599, China. Dr.Luyu-Wang@hotmail.com.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry

|February 25, 2026

Summary

Mesoporous polydopamine microspheres create a highly sensitive sensor for detecting formaldehyde (HCHO) at low concentrations. This advancement offers rapid, stable, and selective HCHO monitoring at room temperature.

Keywords:

Formaldehyde Polydopamine Quartz crystal microbalance Sensor

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Area of Science:

Materials Science
Chemical Sensing
Nanotechnology

Background:

Formaldehyde (HCHO) is a common indoor air pollutant with significant health implications.
Accurate and sensitive detection methods for HCHO are crucial for environmental monitoring and public health.

Purpose of the Study:

To synthesize mesoporous polydopamine (PDA) microspheres for use in a quartz crystal microbalance (QCM) sensor.
To evaluate the sensor's performance for ultra-sensitive formaldehyde detection.

Main Methods:

Mesoporous PDA microspheres were synthesized and characterized for morphology, pore size, and surface area.
A QCM sensor was fabricated using PDA microspheres as the sensing layer.
The sensor's response to varying HCHO concentrations was tested at room temperature.

Main Results:

Characterization confirmed uniform microspheres with 20 nm mesopores and a surface area of 62.28 m²/g.
The optimized sensor achieved a minimum detection limit of 5 ppb and high sensitivity (2.451 Hz/ppb).
The sensor demonstrated rapid response/recovery times (3s/4s), excellent linearity (R²=0.9966), and good stability and selectivity.

Conclusions:

Mesoporous PDA microspheres are effective sensing materials for high-performance formaldehyde detection.
The developed QCM sensor offers a promising solution for ultra-sensitive and rapid HCHO monitoring.
Humidity was found to enhance the sensor's formaldehyde sensing response.