Detection of n-Propanol Down to the Sub-ppm Level Using p-Type Delafossite AgCrO₂ Nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• n-propanol is a crucial biomarker for early lung cancer diagnosis.
• Detecting n-propanol at sub-ppm levels presents significant challenges for current sensor technologies.
• There is a need for sensitive, selective, and low-cost gas sensors for volatile organic compounds (VOCs).

Purpose of the Study:

• To develop a novel n-propanol gas sensor with an ultralow detection limit.
• To investigate the sensing properties of AgCrO2 nanoparticles for n-propanol detection.
• To elucidate the sensing mechanism of AgCrO2 for n-propanol.

Main Methods:

• Synthesis of AgCrO2 nanoparticles using a simple hydrothermal method.
• Fabrication and testing of a metal oxide semiconductor gas sensor based on AgCrO2.
• Utilizing first-principles calculations and energy band theoretical analysis to understand the sensing mechanism.

Main Results:

• The AgCrO2 sensor achieved an ultralow detection limit of 100 ppb for n-propanol.
• AgCrO2 demonstrated superior performance compared to CuCrO2 and SnO2, including higher selectivity, dynamic response, and linearity.
• The sensor operated effectively at a lower working temperature.
• The sensing mechanism involves chemical adsorption on silver and dehydrogenation on chromium.

Conclusions:

• AgCrO2 nanoparticles are highly effective for sensitive and selective detection of n-propanol at sub-ppm levels.
• The developed sensor offers a promising solution for simple and immediate early lung cancer diagnosis.
• This work provides a pathway for designing advanced sensitive materials for trace VOC detection.