Development of Scanning Thermal Microscope with Microscale Quantitative Temperature Measurement Function.

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Scanning Thermal Microscope (SThM) provides topological and thermal images by a temperature sensing cantilever probe. Usually, the SThM passively measures temperature or thermal properties by detecting thermal information through a contact point on a sample and converting it with a calibration curve. However, the passive method can't take quantitative temperature image because measured values are influenced by various factors such as surface temperature, thermal properties, unevenness of sample surface, adsorption layer, and so on. Therefore, we have developed a novel active method for quantitative temperature imaging regardless of variations in thermal conductance at the contact point. In the active method, a thermal feedback control step maintains the cantilever at the same temperature as the sample surface by detecting heat flow along the cantilever and feeding power proportional to it to the cantilever, then cantilever temperature is measured by another sensor on it. We experimentally examined the active method by producing multi-function cantilevers with a heat flow sensor, electric heater and a temperature sensor and a feedback circuit. The active system demonstrated good performance in real temperature measurement regardless of thermal