{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["4"],"submitter":["Choi YR"],"pubmed_abstract":["Solid silicon nanowires and their luminescent properties have been widely studied, but lesser is known about the optical properties of mesoporous silicon nanowires (mp-SiNWs). In this work, we present a facile method to generate greenish-blue photoluminescence (GB-PL) by fast scanning a focused green laser beam (wavelength of 532 nm) on a close-packed array of mp-SiNWs to carry out photo-induced chemical modification. The threshold of laser power is 5 mW to excite the GB-PL, whose intensity increases with laser power in the range of 5-105 mW. The quenching of GB-PL comes to occur beyond 105 mW. The in-vacuum annealing effectively excites the GB-PL in the pristine mp-SiNWs and enhances the GB-PL of the laser-modified mp-SiNWs. A complex model of the laser-induced surface modification is proposed to account for the laser-power and post-annealing effect. Moreover, the fast scanning of focused laser beam enables us to locally tailor mp-SiNWs en route to a wide variety of micropatterns with different optical functionality, and we demonstrate the feasibility in the application of creating hidden images."],"journal":["Scientific reports"],"pagination":["4940"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC4018655"],"repository":["biostudies-literature"],"pubmed_title":["Laser-induced greenish-blue photoluminescence of mesoporous silicon nanowires."],"pmcid":["PMC4018655"],"pubmed_authors":["Liu J","Huang Z","Zheng M","Tok ES","Choi YR","Bai F","Sow CH"],"additional_accession":[]},"is_claimable":false,"name":"Laser-induced greenish-blue photoluminescence of mesoporous silicon nanowires.","description":"Solid silicon nanowires and their luminescent properties have been widely studied, but lesser is known about the optical properties of mesoporous silicon nanowires (mp-SiNWs). In this work, we present a facile method to generate greenish-blue photoluminescence (GB-PL) by fast scanning a focused green laser beam (wavelength of 532 nm) on a close-packed array of mp-SiNWs to carry out photo-induced chemical modification. The threshold of laser power is 5 mW to excite the GB-PL, whose intensity increases with laser power in the range of 5-105 mW. The quenching of GB-PL comes to occur beyond 105 mW. The in-vacuum annealing effectively excites the GB-PL in the pristine mp-SiNWs and enhances the GB-PL of the laser-modified mp-SiNWs. A complex model of the laser-induced surface modification is proposed to account for the laser-power and post-annealing effect. Moreover, the fast scanning of focused laser beam enables us to locally tailor mp-SiNWs en route to a wide variety of micropatterns with different optical functionality, and we demonstrate the feasibility in the application of creating hidden images.","dates":{"release":"2014-01-01T00:00:00Z","publication":"2014 May","modification":"2025-04-05T10:20:46.47Z","creation":"2019-03-27T01:28:04Z"},"accession":"S-EPMC4018655","cross_references":{"pubmed":["24820533"],"doi":["10.1038/srep04940"]}}