Journal
MOLECULES
Volume 26, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/molecules26082338
Keywords
angle deposition; polarization; SERS
Funding
- National Natural Science Foundation of China [61675090, 61675080]
Ask authors/readers for more resources
Colloidal lithography is employed to fabricate square-shaped and cone-shaped Au nanostructures, with control of unit spacing by adjusting Au deposition time to achieve enhanced local field, leading to detection limit down to 5 pg/mL for liver cancer marker AFP.
Colloidal lithography is an efficient and low-cost method to prepare an ordered nanostructure array with new shapes and properties. In this study, square-shaped and cone-shaped Au nanostructures were obtained by 70 degrees angle deposition onto polystyrene bead array with the diameter of 500 nm when a space of 120 nm is created between the neighbor beads by plasma etching. The gaps between the units decrease when the Au deposition time increases, which leads to the polarized enhanced local field, in agreement with the surface-enhanced Raman scattering spectra (SERS) observations and finite-difference time-domain (FDTD) simulations. When the Au deposition time increased to 5 min, 5 nm gaps form between the neighbor units, which gave an enhancement factor of 5 x 10(9). The SERS chip was decorated for the detection of the liver cancer cell marker Alpha-fetoprotein (AFP) with the detection limit down to 5 pg/mL.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available