Journal
NANO LETTERS
Volume 20, Issue 7, Pages 5159-5166Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01378
Keywords
one-dimensional nanomaterials; laser direct writing; two-photon polymerization; 3D micro-/nanofabrication; second harmonic generation
Categories
Funding
- National Key RAMP
- D Program of China [2018YFB1105400]
- National Natural Science Foundation of China [61774067]
- Fundamental Research Funds for the Central Universities [HUST: 2017KFXKJC001, 2018KFYXKJC027]
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The precise placement of semiconductor nanowires(NWs) into two- or three-dimensional (2D/3D) micro-/nanoarchitectures is a key for the construction of integrated functional devices. However, long-pending challenges still exist in high-resolution 3D assembly of semiconductor NWs. Here, we have achieved directional assembly of zinc oxide (ZnO) NWs into nearly arbitrary 3D architectures with high spatial resolution using two-photon polymerization. The NWs can regularly align in any desired direction along the laser scanning pathway. Through theoretical calculation and control experiments, we unveiled the laser-induced assembly mechanism and found that the nonoptical forces are the dominant factor leading to the directional assembly of ZnO NWs. A ZnO-NW-based polarization-resolved UV photodetector of excellent photoresponsivity was fabricated to demonstrate the potential application of the assembled ZnO NWs. This work is expected to promote the research on NW-based integrated devices such as photonic integrated circuits, sensors, and metamaterial with unprecedented controllability of the NW's placement in three dimensions.
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