High sensitivity optical pressure sensor based on graphene/molybdenum disulfide composite film

Area of Science:

• Materials Science
• Nanotechnology
• Optical Engineering

Background:

• Optical pressure sensors are crucial for various applications.
• Existing sensors often lack the required sensitivity for delicate measurements.
• Graphene and Molybdenum disulfide (MoS2) composites offer unique optoelectronic properties.

Purpose of the Study:

• To propose and demonstrate a high-sensitivity optical pressure sensor.
• To investigate the performance of a graphene/MoS2 composite film in a novel sensor design.
• To achieve superior sensitivity compared to conventional optical pressure sensors.

Main Methods:

• Fabrication of a sensor comprising a polydimethylsiloxane (PDMS) pyramid, graphene/MoS2 composite film, and lithium niobate waveguide.
• Utilizing the deformation-induced refractive index change in the composite film.
• Detecting pressure via variations in the interference spectrum.

Main Results:

• The sensor prototype demonstrated a sensitivity of 575.233 nm/kPa.
• This sensitivity was achieved within the low-pressure range of 0-0.123 kPa.
• The achieved sensitivity significantly surpasses that of typical optical pressure sensors.

Conclusions:

• The graphene/MoS2 composite film enables highly sensitive optical pressure sensing.
• The proposed sensor design exhibits excellent performance for low-pressure detection.
• This technology holds potential for advanced applications requiring precise pressure monitoring.