Year: 2026
Type: article
Abstract: The detection of ammonia (NH3) at room temperature is of significant importance for environmental monitoring, industrial safety and early disease diagnosis. In this work, a novel room-temperature ammonia sensor was developed by combining graphene oxide with WO3 quantum dots. The as-fabricated sensor exhibited excellent comprehensive sensing performance, including high sensitivity, rapid response, outstanding selectivity, and reliable long-term stability. Specifically, when exposed to 10 ppm NH3, the sensor based on 1.5% GO@WO3 nanocomposites achieved a frequency shift of 578 Hz, which was 6.4 times that of the pure WO3 QDs sensor. The theoretical limit of detection (LOD) of the sensor was calculated to be 60 ppb, enabling ppb-level NH3 detection. In addition, the sensor demonstrated good long-term stability over a two-week period. The enhanced performance of the GO@WO3 nanocomposite sensor is attributed to the formation of an ohmic contact between GO and WO3, which eliminates charge transfer barriers, promotes oxygen adsorption, and amplifies the sensing signal. This work provides a simple, efficient, and practical solution for room-temperature NH3 detection, offering significant advantages over traditional single-component sensors.
Source: Nanomaterials
DOI: 10.3390/nano16080467
Authors: Lina Wang, Chong Li, Lei Peng, Junyu Niu
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,896
Funder: Huainan Normal University
Awards: G2256887396, G3699934611
OpenAlex ID: W7154467429