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Conference Paper: Wavelength-Dependent Light-Driven Nanomotor
Title | Wavelength-Dependent Light-Driven Nanomotor |
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Authors | |
Issue Date | 2016 |
Publisher | Materials Research Society. |
Citation | 2016 Materials Research Society Fall Meeting & Exhibit, Boston, Massachusetts, USA, 27 November - 2 December 2016 How to Cite? |
Abstract | Nano/micro-motor shows various promising applications in the areas of biomedicine, catalysis, environmental remediation.[1-4] The precise controlling of the speed and direction are the most important issues that must be solved for the real application. Light controlling is a newly proposed hot topic in this area[5,6]. Here we report a visible-light-driven silicon nanomotor based on core-shell p-n junction, which shows size and wavelength dependent motion behavior. Under light illumination, photoexcited carriers decompose hydrogen peroxide on p-Si and n+-Si surface and generate H+ and OH- respectively. The localized electrophoretic field generated by unbalanced ions propels the motion of the nanomotor. The proposed self-electrophoretic mechanism was demonstrated by real-time individual motor motion and ionic strength measurement. The as-prepared motor shows instant “ON-OFF” response through switching the “ON-OFF” of PEC reaction by light illumination. The morphology of fracture surface shows crucial effect on the motion trajectory, which proves that the chemical energy to the mechanical energy is sufficient and fast even in the nanoscale level. The silicon nanomotor shows wavelength and diameter dependent motion speed, which originates from the different absorption, in line with the results of finite-difference time domain (FDTD) simulations. These results imply a promising prospect for novel design of individually light-controlled nano/micro machines. |
Description | Symposium BM6: Fabrication, Characterization and Applications of Bioinspired Nanostructured Materials - BM6.4: Poster Session I - paper no. BM6.4.35 |
Persistent Identifier | http://hdl.handle.net/10722/245503 |
DC Field | Value | Language |
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dc.contributor.author | Wang, J | - |
dc.contributor.author | Xiong, Z | - |
dc.contributor.author | Dai, B | - |
dc.contributor.author | Tang, J | - |
dc.date.accessioned | 2017-09-18T02:11:51Z | - |
dc.date.available | 2017-09-18T02:11:51Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | 2016 Materials Research Society Fall Meeting & Exhibit, Boston, Massachusetts, USA, 27 November - 2 December 2016 | - |
dc.identifier.uri | http://hdl.handle.net/10722/245503 | - |
dc.description | Symposium BM6: Fabrication, Characterization and Applications of Bioinspired Nanostructured Materials - BM6.4: Poster Session I - paper no. BM6.4.35 | - |
dc.description.abstract | Nano/micro-motor shows various promising applications in the areas of biomedicine, catalysis, environmental remediation.[1-4] The precise controlling of the speed and direction are the most important issues that must be solved for the real application. Light controlling is a newly proposed hot topic in this area[5,6]. Here we report a visible-light-driven silicon nanomotor based on core-shell p-n junction, which shows size and wavelength dependent motion behavior. Under light illumination, photoexcited carriers decompose hydrogen peroxide on p-Si and n+-Si surface and generate H+ and OH- respectively. The localized electrophoretic field generated by unbalanced ions propels the motion of the nanomotor. The proposed self-electrophoretic mechanism was demonstrated by real-time individual motor motion and ionic strength measurement. The as-prepared motor shows instant “ON-OFF” response through switching the “ON-OFF” of PEC reaction by light illumination. The morphology of fracture surface shows crucial effect on the motion trajectory, which proves that the chemical energy to the mechanical energy is sufficient and fast even in the nanoscale level. The silicon nanomotor shows wavelength and diameter dependent motion speed, which originates from the different absorption, in line with the results of finite-difference time domain (FDTD) simulations. These results imply a promising prospect for novel design of individually light-controlled nano/micro machines. | - |
dc.language | eng | - |
dc.publisher | Materials Research Society. | - |
dc.relation.ispartof | Materials Research Society Fall Meeting & Exhibit, MRS 2016 | - |
dc.rights | Materials Research Society Fall Meeting & Exhibit, MRS 2016. Copyright © Materials Research Society. | - |
dc.title | Wavelength-Dependent Light-Driven Nanomotor | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Tang, J: jinyao@hku.hk | - |
dc.identifier.authority | Tang, J=rp01677 | - |
dc.identifier.hkuros | 277128 | - |
dc.publisher.place | United States | - |