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The use of femto-second lasers to trigger powerful explosions of gold nanorods to destroy cancer cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
6400 489 2013 6 PDF Available
Title
The use of femto-second lasers to trigger powerful explosions of gold nanorods to destroy cancer cells
Abstract

Gold nanorods (AuNRs) with an aspect ratio of 3–4 exhibit large cross sections for single and multi photon light absorption processes in the near infrared region due to surface plasmon resonances. 800 nm laser pulses with the 150 fsec pulse duration (fs laser) can trigger explosions of AuNRs. The fs laser pulses at 20 W/mm2 equivalent continuous wave (cw) power density blasted AuNRs in QGY human carcinoma cells as confirmed using transmission electron microscopy, while a cw laser at the same power density and dose did not. Cell survival studies further demonstrated that the cw laser at a dose of 15 J/mm2 resulted in the death of 15% of AuNRs-loaded cells, probably due to a photothermal effect, while the fs laser at only 1.5 J/mm2 killed more than 90% of AuNRs-loaded cells, indicating that the fs laser-triggered explosions of intracellular AuNRs are powerful enough to instantaneously kill tumour cells.

Keywords
Gold nanorods; Femto-second laser pulses; Nanoexplosion; Surface plasmon resonances; Cancer cells
First Page Preview
The use of femto-second lasers to trigger powerful explosions of gold nanorods to destroy cancer cells
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 34, Issue 26, August 2013, Pages 6157–6162
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering