In this paper,ZnO/SnO_(2) core-shell micropyramids were successfully prepared via a chemical vapor deposition process that is based on the epitaxial growth of SnO_(2) on the surface of ZnO hexagonal micropyramids.Upon...In this paper,ZnO/SnO_(2) core-shell micropyramids were successfully prepared via a chemical vapor deposition process that is based on the epitaxial growth of SnO_(2) on the surface of ZnO hexagonal micropyramids.Upon controlling appropriate deposition times and flow rates of the precursor,two epitaxial growth modes of SnO_(2),i.e.a continuous thick film and well-arranged one-dimensional nanostructures were observed in the ZnO/SnO_(2) core-shell micropyramids.Taking advantages of the difference in acid resistance between ZnO and SnO_(2),the as-prepared ZnO/SnO_(2) micropyramids were further converted into SnO_(2) hollow micropyramids with a facile acid-etching treatment.Structural analysis revealed that the lattice mismatch degree between epitaxial planes determines the preferential growth direction of the SnO_(2) epitaxial layer on the ZnO surface.Compared to the pristine ZnO template,interestingly,the ZnO/SnO_(2) core-shell micropyramids exhibited very strong green emission around 504 nm.Such enhanced green emission should be induced by high-density structural defects generated in the interfacial area during the epitaxial growth.展开更多
The development of pressure sensor arrays capable of distinguishing the shape and texture details of objects is of considerable interest in the emerging fields of smart robots,prostheses,human-machine interfaces,and a...The development of pressure sensor arrays capable of distinguishing the shape and texture details of objects is of considerable interest in the emerging fields of smart robots,prostheses,human-machine interfaces,and artificial intelligence(AI).Here we report an integrated pressure sensor array,by combining solution-processed two-dimensional(2D)MoS2 van der Waals(vdW)thin film transistor(TFT)active matrix and conductive micropyramidal pressure-sensitive rubber(PSR)electrodes made of polydimethylsiloxane/carbon nanotube composites,to achieve spatially revolved pressure mapping with excellent contrast and low power consumption.We demonstrate a 10×10 active matrix by using the 2D MoS2 vdW-TFTs with high on-off ratio>10^(6),minimal hysteresis,and excellent device-to-device uniformity.The combination of the vdW-TFT active matrix with the highly uniform micropyramidal PSR electrodes creates an integrated pressure sensing array for spatially resolved pressure mapping.This study demonstrates that the solution-processed 2D vdW-TFTs offer a solution for active-matrix control of pressure sensor arrays,and could be extended for other active-matrix arrays of electronic or optoelectronic devices.展开更多
基金supported by the National Natural Science Foundation of China(21171142)the National Basic Research Program of China(2011CBA00508)+1 种基金the program for New Century Excellent Talents in University(NCET-11-0294)the Fundamental Research Funds for the Central Universities.
文摘In this paper,ZnO/SnO_(2) core-shell micropyramids were successfully prepared via a chemical vapor deposition process that is based on the epitaxial growth of SnO_(2) on the surface of ZnO hexagonal micropyramids.Upon controlling appropriate deposition times and flow rates of the precursor,two epitaxial growth modes of SnO_(2),i.e.a continuous thick film and well-arranged one-dimensional nanostructures were observed in the ZnO/SnO_(2) core-shell micropyramids.Taking advantages of the difference in acid resistance between ZnO and SnO_(2),the as-prepared ZnO/SnO_(2) micropyramids were further converted into SnO_(2) hollow micropyramids with a facile acid-etching treatment.Structural analysis revealed that the lattice mismatch degree between epitaxial planes determines the preferential growth direction of the SnO_(2) epitaxial layer on the ZnO surface.Compared to the pristine ZnO template,interestingly,the ZnO/SnO_(2) core-shell micropyramids exhibited very strong green emission around 504 nm.Such enhanced green emission should be induced by high-density structural defects generated in the interfacial area during the epitaxial growth.
基金Y.H.acknowledges the financial support from the Office of Naval Research through award N00014-18-1-2491.X.F.D.acknowledged the support from the US Department of Energy,Office of Basic Energy Sciences,Division of Materials Science and Engineering through award DE-SC0018828(material preparation).
文摘The development of pressure sensor arrays capable of distinguishing the shape and texture details of objects is of considerable interest in the emerging fields of smart robots,prostheses,human-machine interfaces,and artificial intelligence(AI).Here we report an integrated pressure sensor array,by combining solution-processed two-dimensional(2D)MoS2 van der Waals(vdW)thin film transistor(TFT)active matrix and conductive micropyramidal pressure-sensitive rubber(PSR)electrodes made of polydimethylsiloxane/carbon nanotube composites,to achieve spatially revolved pressure mapping with excellent contrast and low power consumption.We demonstrate a 10×10 active matrix by using the 2D MoS2 vdW-TFTs with high on-off ratio>10^(6),minimal hysteresis,and excellent device-to-device uniformity.The combination of the vdW-TFT active matrix with the highly uniform micropyramidal PSR electrodes creates an integrated pressure sensing array for spatially resolved pressure mapping.This study demonstrates that the solution-processed 2D vdW-TFTs offer a solution for active-matrix control of pressure sensor arrays,and could be extended for other active-matrix arrays of electronic or optoelectronic devices.
