**3.2 Tungsten disulfide (WS2)**

WS2 nanoflakes were used for lithium ion battery applications. They showed reversible capacity of 680 mA h/g and 86.2% of the initial capacity after 20 cycles [19]. Pawbake et al. reported that WS2 nanoparticle was used for photodetector and humidity sensing applications [20]. It was found that the WS2 nanoparticlebased humidity sensor exhibited sensitivity of 469%, response time of ∼12 s, and recovery time of ∼13 s. In case of based photodetection application, WS2 showed a sensitivity of ∼137% under white light illumination. The response and recovery times were ∼51 and ∼88 s, respectively [20].
