Graphitic Patterns on CVD Diamond Plate as Microheating/Thermometer Devices

Abstract

A simple compact temperature sensor and microheater in a wide temperature range has been developed, realizing a laser-patterned resistive structure on the surface of a synthetic polycrystalline diamond plate. Imaging and spectroscopy techniques used to investigate morphology, structure, and composition of the pattern showed that it incorporates different nondiamond carbon phases. Transport experiments revealed the semiconducting behavior of this microresistor. Thermal power measurements versus temperature are presented. A possible application of this device that may easily match compact experimental layouts avoiding both thermal anchoring offset and mechanical stress between sample and sensor is discussed. The patterned structure undergoes testing as a microthermometer, providing fast response and excellent stability versus time. It exhibits a good sensitivity that coupled to an easy calibration procedure minimizes errors and guarantees high accuracy. Plot of temperature versus input power of the resistive patterned line used as microheater shows a linear behavior in an extended temperature range.

Fluorescent N-Doped Carbon Dots as in Vitro and in Vivo Nanothermometer

“…Monitoring the precise variation of temperature is very important for the deep understanding of the reaction mechanism and dynamics in nanosystems, as well as the behavior of a single living cell. − So far, methods developed for determining temperature in nano- and microspaces include thermocouple, heat resistance, thermistor, PN junction and integrated temperature sensor, gallium-filled carbon nanotube sensor, crystal oscillator, and infrared. − The temperature can also be detected by the interaction between temperature and molecular structure with the help of IR spectroscopy, but the in situ and noncontact detection of temperature in nanospace is still a huge challenge in the present technology. As a new emerging member in carbonaceous materials, carbon dots (CDs) have received much attention due to their low cost, good biocompatibility, and unique photoluminescence properties. − Particularly, fluorescent CDs applied in biology-relevant fields have been widely reported, such as cellular imaging, photothermal therapy, and photodynamic therapy. − It is also reported the fluorescence intensity of CDs can decrease with temperature increasing .…”