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In this paper, we have designed a low-cost scanning tunneling microscope(STM) priced at 300 USD or 2000 CNY. This microscope is suitable foreducational purposes and low-demand research imaging at the nanometer level.This microscope's motion components and scanner are controlled usingpiezoelectric materials, avoiding the thermal drift associated with traditionalmotor control. Our tip approach algorithm, which considers the capacitance andfriction characteristics during piezoelectric slider movement, has reduced thetime required for sample loading to establish tunneling current toapproximately 1 minute. The dimensions of the microscope body are45x45x31.5mm(WxLxH), and the control voltage does not exceed 15V, ensuring thesafety of operators with limited experience. In the performance verification,we performed a scanning tunneling scan on a Highly Oriented PyrolyticGraphite(HOPG) sample with bias voltages of 50mV and 60mV, resulting in clearobservations of the atomic features of HOPG in the STM pattern.

Open STM: A low-cost scanning tunneling microscope with a fast approach method