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Stable and Selective Humidity Sensing Using Stacked Black Phosphorus Flakes.

Poya Yasaei, Amirhossein Behranginia, Tara Foroozan

¹Department of Mechanical Engineering, Chungbuk National University , Cheongju, 361-763, South Korea.

|September 25, 2015

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Black phosphorus (BP) films demonstrate ultrasensitive humidity detection, showing a significant current increase with relative humidity (RH). These stable BP sensors offer trace-level detection and potential for various applications.

Area of Science:

Materials Science
Chemical Sensing
Nanotechnology

Background:

Black phosphorus (BP) atomic layers degrade in humid air.
Robust BP configurations like films offer potential for practical applications.

Purpose of the Study:

To explore the sensing characteristics of black phosphorus (BP) films towards humid air.
To evaluate the sensitivity, selectivity, and stability of BP film sensors for humidity detection.

Main Methods:

Fabrication of black phosphorus (BP) films.
Measurement of BP sensor response to varying relative humidity (RH) levels.
Mechanistic studies involving ionic current modulation and surface chemistry analysis.

Main Results:

Keywords:

black phosphorus humidity sensing liquid-phase exfoliation phosphorene two-dimensional (2D) materials

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BP films exhibited an ultrasensitive and selective response to humid air.
Drain current increased by approximately 4 orders of magnitude with RH change from 10% to 85%.
Sensors showed high stability with minimal drift after 3 months of exposure.

Conclusions:

BP film sensors achieve high-performance humidity detection.
The sensing mechanism involves water autoionization and ionic solvation on BP surfaces.
BP films are promising for applications in energy, catalysis, and sensing.