  We report the fabrication and human trial of a novel wearable temperature
sensor based on WS2-QDs/RGO; which performs instant measurement like
thermometer in a wide temperature range: 77K-398 K, in both static- and instant
mode. The device is simple, scalable, flexible and cost-effective, where
nanoscience and technology played a vital role behind its concept and
realization. The WS2-QDs/RGO heterostructure is developed by decorating WS2-QDs
on pre-RGO coated cotton textile. In static mode, the crucial parameters such
as temperature coefficient of resistance (TCR) and thermal hysteresis (Hth)
were analyzed in depth to get the intricate mechanism behind the working of a
temperature sensor; and check its worthiness to be a better candidate in the
field of temperature sensor. Temperature sensing data at both high- and low
temperatures are very much encouraging; and endorses its viability. Human trial
is conducted to make reliable and hassle free temperature monitoring like
thermometer where the sensor device is found capable to measure accurate body
temperature with exceptional resolution i.e. the minimum change in temperature
the device can measure is ~0.06K in addition to, fast response- and recovery
time ~1.4 s and 1.7 s respectively. In every sense, the developed sensor has
exhibited highest degree of superiority vis-a-vis its counterpart commercial
thermometer used in healthcare. Besides, the device has passed through all
deformation test successfully and proved its mettle. This sensor device proved
its flexibility and stability under various mechanical deformation(s), showing
its promising potential for future generation wearable health monitoring
devices. To the best of our knowledge, this is the first report on WS2 in
general, and WS2-QDs, in specific, based temperature sensing device and its
operational demonstration as of now.
