fig5

From: Recent advances in room-temperature hydrogen sulfide gas sensors: materials design, interface engineering, and sensing mechanisms

Figure 5. Device design and integration for intelligent H₂S sensing. (A) Self-powered wireless H₂S sensing platform showing the device and adsorption sites (A₁), smart food-packaging test and OCV evolution (A₂-A₄), wireless leakage alarm (A₅), and periodontitis monitoring (A₆-A₈). Figure 5A is reproduced with permission from Ref.^[74]. Copyright 2026, Wiley-VCH; (B) Portable breath-analysis system for periodontitis diagnosis showing the detection protocol (B₁), analyzer structure (B₂), clinical measurement (B₃), and smartphone readout (B₄ and B₅). Figure 5B is reproduced from Ref.^[65], under CC BY 4.0 license. OCV: Open-circuit voltage; ppb: parts-per-billion.