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We analyzed the effects of humidity on the H2S sensing ability of the undoped, Zn-doped, and Fe-doped TiO2 nanotube (TiNT)-based gas sensors. The 0.1 M Zn-doped TiNT-based gas sensor had more stable responses to 50 ppm H2S at 300°C compared to the undoped TiNT when the relative humidity (RH) ranged from 3 to 85%RH. For the 0.1 M Fe-doped TiNT sensor, the response reached the highest value (34.19-50 ppm H2S) at 70%RH. The Fe-doped TiNT sensors maintained relatively high responses when the relative humidity was below 60%RH. To determine the relationship between the sensing mechanism and TiO2 band structures and to determine the effect of water on the sensing mechanism, the systematic density functional theory (DFT) calculations for adsorption modes were performed. We found that metal ion doping was effective in improving the performance of H2S TiNT film-based gas sensors under different relative humidities. We also demonstrated the value of metal-doped TiNT gas sensors in practical environments. [ABSTRACT FROM AUTHOR]

Adhesive composite hydrogels have received increasing attention in the fields of wearable sensors, electronic skin, and bioelectronic interfaces. However, combining good adhesiveness and high strength in a single composite hydrogel remains challenging. To address this issue, a polydopamine (PDA)-modified nanocellulose (PCNF)/polyacrylamide (PAM) composite hydrogel was developed, which exhibits good adhesiveness (40 kPa), good durability (1500 rpm), excellent frost resistance (-42 °C), and good sensitivity (GF = 1.6). The composite hydrogel exhibits self-healing and conductive properties, making it suitable for sensing and Morse code applications. The obtained composite hydrogels have potential applications in various wearable devices, wireless human computer interfaces, human activity monitoring, and remote encrypted transmissions.