Polyaniline Emeraldine Salt is a conducting polymer of the semi-flexible rod polymer family. Although the compound itself was discovered over 150 years ago, only since the early 1980s has polyaniline captured the intense attention of the scientific community. This interest is due to the rediscovery of high electrical conductivity. Amongst the family of conducting polymers and organic semiconductors, polyaniline has many attractive processing properties.

Polyaniline Emeraldine Salt have elicited much interest among researchers because of their reasonably good conductivity, stability, ease of preparation, affordability and redox properties compared to other organic compounds. In particular, the electronic and electrochemical properties of conducting polymers have made them find applications in photovoltaic cells, organic light emitting diode and sensors.

Polyaniline (Emeraidine Salt): is soluble in a number of organic solvents such as, dimethyl sulfoxide, chloroform, tetrahydrofuran, dimethyl formamide, and methyl pyrrolidinone. This is because in this state there are no cationic charges present in Polyaniline Emeraldine Salt. theemeraldine salt is insoluble in aqueous solutions and most common organic solvents because in this state PANI has cationic charges present in its polymer backbone.

Polyaniline Emeraldine Salt is a variety of forms that differs is chemical ans physical properties. The must common green protonated emeraldine has conductivity an a semiconductor level of the order of 10⁰Scm^-1. Many order of magnitude higher than that of comman polymers (<10^-9Scm^-1) but lower then that of typical metals (>10⁴ Scm^-1). Applications inorganic electrodes sensors actuators other uses are based on the combination of electrical properties typical of semiconductor.