5.5band
Devadhasan et al reported a disposable hydrogel Devadhasan et al reported a disposable hydrogel test strip consisting of titanium nanoparticles, PVA hydrogels, and chemical pH-responsive indicators to detect toxic gases such as hydrogen fluoride (HF), chlorine (Cl₂), ammonia (NH₃), and formaldehyde (CH₂O). Colorimetric detection based on color ch...