Abstract
In this paper, a novel plasmonic grating sensor platform was developed and tested for feasibility using a lights-ON fluorescence-based DNA assay. The sensor platform combined the fluorescence enhancement of a grating-based plasmonic platform with the electric field intensifying effects of nanoscale cones and cavities. The gratings were made through a microcontact printing process that replicated HD-DVD disks in polymethylsilsesquioxane and coated with a thin gold film. Nanocavities were incorporated into the sensor platform during the printing process and nanocones were incorporated during the 100-nm gold deposition process. Fluorescently tagged single-strand (ss) DNA molecules were immobilized onto the surface and were designed such that the molecules would fluoresce when bound to a complementary sequence. Sensor substrates were imaged after exposure to a mismatched and matched ssDNA to quantify the fluorescence enhancement of the sensor. Exposure to matched ssDNA resulted in fluorescent emission from the grating that was 13.6× brighter than flat gold, while the nanocones and nanocavities were 37.5× and 47.4× brighter than flat gold, respectively.
Original language | English (US) |
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Article number | 7270989 |
Pages (from-to) | 3403-3408 |
Number of pages | 6 |
Journal | IEEE Sensors Journal |
Volume | 16 |
Issue number | 10 |
DOIs | |
State | Published - May 15 2016 |
All Science Journal Classification (ASJC) codes
- Instrumentation
- Electrical and Electronic Engineering
Keywords
- Aptamer
- Fluorescence
- Grating
- Microcontact
- Nanocavity
- Nanocone
- Plasmonic