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A flexible transparent colorimetric wrist strap sensor.

Ting Wang¹, Yunlong Guo², Pengbo Wan²

¹State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P.R. China. pbwan@mail.buct.edu.cn and SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China. hzhang@szu.edu.cn and School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

|December 21, 2016

Summary

Researchers developed a flexible, transparent wrist strap sensor using polydiacetylene/molybdenum disulfide (PDA/MoS2) nanocomposite films. This wearable device offers visible detection of N,N-dimethylformamide (DMF) vapor, showing great potential for smart applications.

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Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Polydiacetylene (PDA) materials are known for their chromic properties, changing color in response to stimuli.
Molybdenum disulfide (MoS2) is a 2D material with unique electronic and structural properties.
Developing portable and sensitive sensors for volatile organic compounds (VOCs) remains a significant challenge.

Purpose of the Study:

To develop a flexible, transparent, and portable sensor device for detecting N,N-dimethylformamide (DMF) vapor.
To enhance the performance of PDA-based sensors by incorporating MoS2.
To demonstrate the potential of the developed sensor for wearable applications.

Main Methods:

Fabrication of a hierarchical polydiacetylene/MoS2 (PDA/MoS2) nanocomposite film.
Characterization of the film's structural, optical, and sensing properties.
Integration of the PDA/MoS2 film into a wearable wrist strap sensor device.

Main Results:

The PDA/MoS2 film exhibited enhanced porosity and transparency compared to pure PDA films.
The sensor demonstrated a linear detection range for DMF vapor from 0.01% to 4%.
A visible blue-to-red color change was observed for DMF detection, enabling naked-eye sensing.

Conclusions:

The developed PDA/MoS2 nanocomposite film is a promising material for sensitive and selective vapor detection.
The flexible and transparent wrist strap sensor shows significant potential for integration into smart wearable devices.
The sensor offers a reliable and visually detectable method for monitoring DMF vapor.