RBFNN-Based PPy/GaN sensor array with wide dynamic range and sub-ppb detection for accurate ammonia identification in human exhaled breath.

ABSTRACT: Detecting ammonia (NH₃) in human breath is vitally important for early warning and disease detection. Polymer composite nanomaterials, which serve as high-performance NH₃ gas sensors, have become a prominent research focus in this field. In this study, polypyrrole (PPy) and various gallium nitride (GaN) nanostructures were selected for synthesis. PPy/GaN gas sensors were successfully fabricated by employing the precisely controllable metal-organic chemical vapor deposition (MOCVD) process in conjunction with in situ oxidative polymerization methods. The gas sensing performance of the sensors was systematically analyzed. The PPy/GaN-1 sensor demonstrated an ultra-wide detection range for NH₃ (100 ppb-1000 ppm) at room temperature, along with exceptional mois

SUBMITTER: Jia Z 

PROVIDER: S-EPMC12756321 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature