Near-field-enhanced, off-resonant laser sintering of semiconductor particles for additive manufacturing of dispersed Au-ZnO-micro/nano hybrid structures

Marcus Lau, R Niemann, Mathias Bartsch, William O'Neill, Stephan Barcikowski

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Off-resonant near-field enhancement by gold nanoparticles adsorbed on crystalline zinc oxide significantly increases the energy efficiency of infrared laser sintering. In detail, ten different gold mass loads on zinc oxide were exposed to 1,064 nm cw-laser radiation. Variation of scan speed, laser power, and spot size showed that the energy threshold required for sintering decreases and sintering process window widens compared to laser sintering of pure zinc oxide powder. Transmission electron microscope analysis after focused ion beam cross sectioning of the sintered particles reveals that supported gold nanoparticles homogenously resolidify in the sintered semiconductor matrix. The enhanced sintering process with ligand-free gold nanoparticles gives access to metal-semiconductor hybrid materials with potential application in light harvesting or energy conversion.
Original languageEnglish
Pages (from-to)1023-1030
Number of pages8
JournalApplied Physics A Materials Science & Processing
Volume114
Issue number4
DOIs
Publication statusPublished - Mar 2014

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