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Spring Celebration

Spring Celebration. Nanotechnology-Based Environmental Sensing. Donald Lucas, Ph.D. D_lucas@lbl.gov Profs. Cathy Koshland (PI), Lydia Sohn, Peidong Yang, and John Arnold. Why Nanotechnology?.

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Spring Celebration

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  1. Spring Celebration Nanotechnology-Based Environmental Sensing Donald Lucas, Ph.D. D_lucas@lbl.gov Profs. Cathy Koshland (PI), Lydia Sohn, Peidong Yang, and John Arnold

  2. Why Nanotechnology? • Nanomaterials exhibit different and sometimes unique properties when compared to gas phase or bulk materials • Can we exploit these properties to detect and quantify species such as heavy metals and biomolecules used in remediation?

  3. Nanoparticles are Everywhere! Nano-onions PbSe PbSe Au and Ag nanoparticles and nanorods Cover Photo: C&E News May 1, 2006 NaCl before and after laser irradiation

  4. Specific Aims • Develop low-cost sensors and sensor arrays for measuring chemical species such as arsenic and mercury using existing nanoparticle properties that can be probed optically and electronically.

  5. Specific Aims • Develop low-cost sensors and sensor arrays for measuring chemical species such as arsenic and mercury using existing nanoparticle properties that can be probed optically and electronically. • Investigate the use of new manufactured nanostructured materials for molecular detection, including structures such as coated nanoparticles and sensor arrays.

  6. Specific Aims • Develop low-cost sensors and sensor arrays for measuring chemical species such as arsenic and mercury using existing nanoparticle properties that can be probed optically and electronically. • Investigate the use of new manufactured nanostructured materials for molecular detection, including structures such as coated nanoparticles and sensor arrays. • Develop methods to identify biomolecules (specific antibodies/antigens used in bioremediation) by probing their unique local electronic properties

  7. Hg(0) Detection UV-Vis spectrum A Surface Plasmon Resonance • 5 nm colloidal gold solution • Temperature controlled Hg bead • 3 x 4.0 mL UV-Vis silica cuvettes in series N2 l (nm) Hg (0)

  8. Gold Morphology Changes with Hg TEM images of the colloidal gold solution before and after mercury exposure. The gold does not agglomerate and the concentration of individual particles in solution increases with Hg exposure. K. Scallan et al. 9th Int. Congress on Toxic Combustion Byproducts (2005).

  9. Arsenic Detection: Shape-dependent Plasmon Resonances F. Kim et al. Angew. Chem. Int. Ed. 2004,43, 3673.

  10. Surface Enhanced Raman Spectroscopy: Ag Nanocrystal Enhancement Factor = 2 x 109! A. Tao et al. Nano. Lett. 3, 1229, 2003. J. Phys. Chem. B 109, 15687, 2005. Nature, 425, 243, 2003.

  11. On-Chip Artificial Pore Saleh & Sohn, Rev. Sci. Inst. (2001) & PNAS (2003) Uses resistive pulse sensing to detect: 1. nm-sized colloids 2. single cells 3. single molecules

  12. Applications Particle Sizing A Novel Immunoassay • Pore length = 1um diam x 10 um long • Device resolution corresponds to 2-4% variation of colloids • Detects size change • No labeling involved

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