The reporter learned from the Chinese Academy of Sciences that Chinese and foreign scientists have collaborated to produce a high-quality piezoelectric material—cadmium sulfide ultra-thin nanosheet film with a thickness of only 2-3 nanometers. This achievement has promoted human micro-world cognition. Related papers were published in the "Scientific Progress" published recently.
Atomic is the material limit of human "operation". Nowadays, humans can "see" a single atom through electrons, and its operation accuracy has reached less than 1 nanometer. But this manipulation is still far from being flexible, let alone assembling atoms. The precise positioning and driving relies on an Actuator, and one of the most important cores of the actuator is a piezoelectric material.
Professor Liu Zheng from Nanyang Technological University, Singapore, and Zhang Yan, a researcher at the Suzhou Nanotechnology and Nanomimicry Institute of the Chinese Academy of Sciences, teamed up with Nanjing University, the Institute of Advanced Manufacturing of the Singapore Bureau of Science and Technology, and Duke University of the United States to establish a chemical vapor deposition method. A high-quality piezoelectric material, a cadmium sulfide (CdS) ultra-thin nanosheet film (thickness of 2-3 nm). Researchers have characterized and systematically studied the piezoelectric properties of cadmium sulfide ultra-thin nanosheets in the vertical direction by scanning probe microscopy and other in-situ characterization techniques, and found that ultra-thin cadmium sulfide nanoplates have three times the body phase in the vertical direction. The large piezoelectric constants of the material, and theoretical simulations well validated this conclusion. These results lay an important foundation for theoretical and experimental construction of ultra-high-precision actuators and new highly sensitive pressure, displacement and strain sensors.
Piezoelectric materials are hailed as “intelligent muscles†for human exploration of the microscopic world. They can obtain subtle deformations through the application of voltages, which in turn enable high-precision driving. They can also be applied to sensors with high accuracy in strain, displacement, and positioning. Scientists believe that achieving ultra-high accuracy at the subatomic scale is still challenging. Ultra-thin piezoelectric materials are expected to play a role in solving this problem: With atomic-scale piezoelectric materials, subatomic resolution positioning and driving are achieved.
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