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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Tunable Graphene/Nitrocellulose Temperature Alarm Sensors.

Wenyuan Wei¹, Yangpeiqi Yi¹, Jun Song¹

¹Department of Materials, The University of Manchester, Manchester M13 9PL, U.K.

ACS Applied Materials & Interfaces

|March 11, 2022

Summary

New graphene and nitrocellulose (NC) sensors provide tunable, fast-response high-temperature alarms. These electrically insulating sensors become conductive upon heating, offering reliable early fire risk detection in various environments.

Keywords:

composite materials fire alarm graphene nitrocellulose temperature sensors warning response

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Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Early detection of high-temperature risks is crucial for fire prevention.
Existing temperature alarm systems may have limitations in response time or applicability.
Graphene and nitrocellulose (NC) are materials with potential for novel sensor applications.

Purpose of the Study:

To develop tunable temperature alarm sensors using multilayer graphene and nitrocellulose (NC).
To investigate the electrical and responsive properties of graphene/NC composites for high-temperature risk monitoring.
To assess the potential applications of these sensors in various environments and conditions.

Main Methods:

Preparation of multilayer graphene/NC composite materials with varying weight ratios.
Characterization of the electrical insulation and conductivity transition at elevated temperatures.
Evaluation of sensor response time, responsive temperature, and working stability under flame exposure.
Testing sensor performance in different forms (paint, wallpaper) and extreme conditions (underwater, vacuum).

Main Results:

The graphene/NC alarm sensor transitions from electrical insulation to conductivity at high temperatures.
A 90% graphene/NC (1:9 wt ratio) sensor showed stable insulation at 200 °C, with a responsive temperature of 232 °C and a 4.4 s response time.
The response temperature and time are tunable by adjusting the graphene/NC ratio.
The sensor exhibits superior flame retardancy and functionality in extreme conditions.

Conclusions:

Tunable graphene/NC composite sensors offer reliable, fast-response early detection of high-temperature risks.
The sensor's properties can be customized for diverse fire-prone scenarios and materials.
Promising applications exist for indoor/outdoor environments, including integration into paints and wallpapers, and use under extreme conditions.