Location deterministic biosensing from quantum-dot-nanowire assemblies

Journal Article · Mon Aug 25 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4893878· OSTI ID:22310977

Liu, Chao ^[1]; Kim, Kwanoh ^[2]

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1. Materials Science and Engineering Program, Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712 (United States)
2. Department of Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712 (United States)

Semiconductor quantum dots (QDs) with high fluorescent brightness, stability, and tunable sizes, have received considerable interest for imaging, sensing, and delivery of biomolecules. In this research, we demonstrate location deterministic biochemical detection from arrays of QD-nanowire hybrid assemblies. QDs with diameters less than 10 nm are manipulated and precisely positioned on the tips of the assembled Gold (Au) nanowires. The manipulation mechanisms are quantitatively understood as the synergetic effects of dielectrophoretic (DEP) and alternating current electroosmosis (ACEO) due to AC electric fields. The QD-nanowire hybrid sensors operate uniquely by concentrating bioanalytes to QDs on the tips of nanowires before detection, offering much enhanced efficiency and sensitivity, in addition to the position-predictable rationality. This research could result in advances in QD-based biomedical detection and inspires an innovative approach for fabricating various QD-based nanodevices.

• OSTI ID: 22310977
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ALTERNATING CURRENT
BRIGHTNESS
EFFICIENCY
ELECTRIC FIELDS
FLUORESCENCE
GOLD
NANOSTRUCTURES
NANOWIRES
QUANTUM DOTS
QUANTUM WIRES
SEMICONDUCTOR MATERIALS
SENSITIVITY
SENSORS