Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 7, Pages 2445-2452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm500062b
Keywords
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Funding
- National Science Foundation (NSF CAREER Award) [DBI 0964216]
- Minnesota Partnership Award for Biotechnology and Medical Genomics
- Camille and Henry Dreyfus Foundation
- NSF MRSEC
- Direct For Biological Sciences
- Div Of Biological Infrastructure [1054191] Funding Source: National Science Foundation
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Surface-based sensors that rely on diffusion for transport of target molecules to the sensor surface can lead to long and sometimes impractical detection time for low analyte concentrations. Here we describe a new method for rapid in situ SERS detection of ultralow subpicomolar concentration of the analyte molecules. The method is based upon a dynamic dielectrophoresis-enabled assembly of metal nanoparticles in the form of pearl chains with nanometer-sized gaps. We demonstrate in situ SERS measurement of benzenethiol in less than 2 min without the requirement of long incubation times. This approach is then extended to detect the biological analyte, adenine, at femtomolar concentrations in a short time from a 2 mu L sample droplet.
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