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Gold Nanorod Rotary Motors Driven by Resonant Light Scattering

Lei Shao (Institutionen för teknisk fysik) ; Zhong-Jian Yang (Institutionen för teknisk fysik, Bionanofotonik) ; Daniel Andrén (Institutionen för teknisk fysik) ; Peter Johansson (Institutionen för teknisk fysik, Bionanofotonik) ; Mikael Käll (Institutionen för teknisk fysik, Bionanofotonik)
ACS Nano (1936-0851). Vol. 9 (2015), 12, p. 12542-12551.
[Artikel, refereegranskad vetenskaplig]

Efficient and robust artificial nanomotors could provide a variety of exciting possibilities for applications in physics, biology and chemistry, including nanoelectromechanical systems, biochemical sensing, and drug delivery. However, the application of current man-made nanomotors is limited by their sophisticated fabrication techniques, low mechanical output power and severe environmental requirements, making their performance far below that of natural biomotors. Here we show that single-crystal gold nanorods can be rotated extremely fast in aqueous solutions through optical torques dominated by plasmonic resonant scattering of circularly polarized laser light with power as low as a few mW. The nanorods are trapped in 2D against a glass surface, and their rotational dynamics is highly dependent on their surface plasmon resonance properties. They can be kept continuously rotating for hours with limited photothermal side effects and they can be applied for detection of molecular binding with high sensitivity. Because of their biocompatibility, mechanical and thermal stability, and record rotation speeds reaching up to 42 kHz (2.5 million revolutions per minute), these rotary nanomotors could advance technologies to meet a wide range of future nanomechanical and biomedical needs in fields such as nanorobotics, nanosurgery, DNA manipulation and nano/microfluidic flow control.

Nyckelord: nanomotors, gold nanorods, light scattering, surface plasmon, optical tweezers



Denna post skapades 2016-01-22. Senast ändrad 2016-08-19.
CPL Pubid: 231122

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik (1900-2015)
Institutionen för teknisk fysik, Bionanofotonik (2007-2015)

Ämnesområden

Nanoteknik

Chalmers infrastruktur