Abstract
This chapter describes the flexible chemical sensors. Traditional chemical sensors based on conductive polymers over polymer substrates are generally flexible. However, with the advent of high-quality nanowires and nanotubes, and the rapid development of flexible electronics, which involves many breakthroughs in the synthesis, and manipulation of these nanoscale materials, significant progress has been made in modern flexible chemical sensors. In traditional conductive polymer chemical sensors, self-organization in many solution-processed, semiconducting conjugated polymers results in complex microstructures, in which ordered microcrystalline domains are embedded in an amorphous matrix. The goals for a flexible chemical sensor are portability, high sensitivity, low false alarm rate, and fast response. After initial positive identification, detailed analysis can be carried out in a laboratory environment. At present, there are a few niche areas that demand flexible chemical sensors for compact electronic device design; for example, leak inspection for underground piping, flammable and/or toxic gas detection in waste storage areas and confined spaces, security checkpoints for improvised explosive devices, sensing functions in wearable smart garments, and sensing and health monitoring in biomedical devices and tools.
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