Nanohelix-Induced Optical Activity of Liquid Metal Nanoparticles

Yang，Lin1; Ma，Yicong2; Lin，Chao3; Qu，Geping4; Bai，Xiaopeng3; Huang，Zhifeng1,2,5

2022

10.1002/smll.202200620

Small   影响因子和分区

1613-6810

1613-6829

Liquid metals (such as gallium or Ga) exist in liquid states under ambient conditions and are hardly sculpted in chiral structures. Herein, through electron-beam evaporation of Ga, hemispherical achiral Ga nanoparticles (NPs) are randomly immobilized along helical surfaces of SiO nanohelices (NHs), functioning as a chiral template. Helical assembly of Ga NPs shows chiroplasmonic optical activity owing to collective plasmon–plasmon interactions, which can be tuned as a function of a helical SiO pitch (P) and the amount of Ga evaporated. At a P of ≈150 nm, the chiroplasmonic optical activity, evaluated with anisotropic g-factor, can be as large as ≈0.1. Because the SiO NHs and Ga NPs have high environmental stability of nanostructures, the chiroplasmonic optical activity shows excellent anti-aging stability, despite slight blue shift and chiroplasmonic degradation for the first 2 weeks. Spontaneous oxidation of the Ga NPs enables the formation of dense GaO layers covering Ga cores to prevent further oxidation and thus to stabilize the chiroplasmonic optical activity. This work devises an alternative approach to impose optical activity onto Ga NPs, providing an additional degree of freedom (i.e., chirality) for Ga-based flexible electronic devices to develop advanced applications of 3D display, circular polarizers, bio-imaging, and bio-detection.

chiral nanoparticles chiral plasmonics glancing angle deposition liquid metals optical activity

SCI ; EI

英语

其他

Natural Science Foundation of Guangdong Province of China[2021A1515010045] ; Chinese Postdoctoral Science Foundation[2020M682915] ; [GRF/12302320] ; [GRF/12301321] ; [NSFC/22075239]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000772012100001

WILEY-V C H VERLAG GMBH

20221311845952

Degrees of freedom (mechanics) ; Gallium ; Liquid metals ; Metal nanoparticles ; Plasmonics ; Silica ; Silicon

Metallurgy:531.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Nanotechnology:761 ; Mechanics:931.1 ; Plasma Physics:932.3

2-s2.0-85126905224

Scopus

1.HKBU Institute of Research and Continuing Education,Shenzhen,Guangdong,518057,China
2.Department of Physics,Hong Kong Baptist University (HKBU),Kowloon Tong,Hong Kong SAR,China
3.Department of Physics,The Chinese University of Hong Kong,Sha Tin,Hong Kong SAR,China
4.Department of Chemistry,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
5.Institute of Advanced Materials,State Key Laboratory of Environmental and Biological Analysis,Golden Meditech Centre for Neuro Regeneration Sciences,HKBU,Kowloon Tong,Hong Kong SAR,China

Yang，Lin,Ma，Yicong,Lin，Chao,et al. Nanohelix-Induced Optical Activity of Liquid Metal Nanoparticles[J]. Small,2022,18.

Yang，Lin,Ma，Yicong,Lin，Chao,Qu，Geping,Bai，Xiaopeng,&Huang，Zhifeng.(2022).Nanohelix-Induced Optical Activity of Liquid Metal Nanoparticles.Small,18.

Yang，Lin,et al."Nanohelix-Induced Optical Activity of Liquid Metal Nanoparticles".Small 18(2022).