Gold Plasmonic Nanosensors
Gold Plasmonic Nanosensors - Related Videos
13:37
Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Cited by 1 •
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Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.
09:12
Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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03:08
Detecting Bacterial Contamination Using Magneto-fluorescent Nanosensors
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This video demonstrates a technique to detect bacterial contaminants in food and water samples using nanosensors. The target pathogenic bacteria are detected through a combination of magnetic relaxation and fluorescence emission modalities.
08:21
Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
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Cited by 1 •
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We demonstrate the fabrication of periodic gold nanocup arrays using colloidal lithographic techniques and discuss the importance of nanoplasmonic films.
03:54
Aqueous Synthesis of Plasmonic Gold-Tin Alloy Nanoparticles
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Cited by 2 •
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Here, the synthesis of gold (Au) seeds is described using the Turkevich method. These seeds are then used to synthesize gold-tin alloy (Au-Sn) nanoparticles with tunable plasmonic properties.
FAQs
Binding near the gold surface matters because localized surface plasmon resonance responds to the optical environment immediately surrounding the nanostructure. When an analyte occupies that region, it changes the local refractive index and consequently the observed optical signal. This spatial relationship lets the sensor convert a surface-binding event into evidence that a chemical or biological target is present.
Gold nanoparticles and nanostructured surfaces establish the plasmonic environment that produces the optical response. Their tunable behavior allows the sensing platform to be adapted to different bioengineering detection goals, while the functionalized surface determines which analytes can interact with it. Together, optical tunability and surface design provide complementary ways to shape the sensor’s performance.
Surface functionalization creates the interface where target binding can be observed. Because the binding event occurs at the sensor surface, it can alter the nearby refractive index and change the plasmonic readout. Functionalization therefore connects the biological or chemical target to the optical mechanism, rather than treating the gold structure as an isolated optical component.
A basic workflow begins with a gold nanoparticle or nanostructured surface that has been functionalized for the target of interest. A sample is then brought into contact with the sensing surface, and the optical response is monitored for a change associated with binding. Because the measurement can be label-free and use small sample volumes, this workflow suits rapid analysis of biological or chemical samples.
Gold plasmonic nanosensors can support measurements involving biomolecules, pathogens, and cellular signals, depending on the functionalized sensing surface and biological context. The optical response connects a target-binding event with an observable measurement, allowing the platform to address more than one class of analyte. This breadth supports applications that range from molecular detection to broader biological monitoring.
These sensors combine nanoscale optical sensing with label-free analysis, rapid measurement, and compatibility with small sample volumes. Those features can support diagnostic platforms when sample quantity and analysis time matter. Their tunable optical responses and functionalized surfaces also make them relevant to point-of-care technologies designed to detect biomolecules, pathogens, or cellular signals in bioengineering settings.