Publications
Size-dependent kinetics of hydriding and dehydriding of Pd nanoparticles
Authors: Christoph Langhammer, Vladimir P. Zhdanov, Igor Zoric, and Bengt Kasemo
Published in: Physical Review Letters
Published: Mar 2010
Abstract: Using a new indirect nanoplasmonic sensing method with subsecond resolution, we have studied hydriding and dehydriding kinetics of Pd nanoparticles in the size range 1.8–5.4 nm. Strong particle-size effects are observed. The scaling of the hydriding and dehydriding time scales satisfies power and power-exponential laws. The former (with an exponent of 2.9) is in perfect agreement with Monte Carlo simulations of diffusion-controlled hydriding kinetics. The latter is explained by the effect of surface tension on hydrogen desorption from the surface layer. The approach is generalizable to other reactant-nanoparticle systems.

Size-dependent hysteresis in the formation and decomposition of hydride in metal nanoparticles
Authors: Christoph Langhammer, Vladimir P. Zhdanov, Igor Zoric, Bengt Kasemo
Published in: Chemical Physics Letters
Published: Feb 2010
Abstract: Using a novel indirect nanoplasmonic sensing platform, we have measured hydrogen absorption/desorption isotherms in Pd nanoparticles with an average diameter from 1.8 to 8 nm at 30 °C. The isotherms are fully reversible at relatively low and high pressures while at intermediate pressures there is hysteresis related to the hydride formation and decomposition. The hysteresis shrinks with decreasing particle size and becomes negligible for particles smaller than 2.5 nm. This feature has been explained in terms of a diminishing contribution of lattice strain to the free energy of hydride formation as the particle size goes down.

A combined nanoplasmonic and electrodeless quartz crystal microbalance setup
Authors: Larsson, E.M., Edvardsson, M.E.M., Langhammer, C., Zoric, I. & Kasemo, B
Published in: Review of Scientific Instruments
Published: Dec 2009
Abstract: We have developed an instrument combining localized surface plasmon resonance (LSPR) sensing with electrodeless quartz crystal microbalance with dissipation monitoring (QCM-D). The two techniques can be run simultaneously, on the same sensor surface, and with the same time resolution and sensitivity as for the individual techniques. The electrodeless QCM eliminates the need to fabricate electrodes on the quartz crystal and gives a large flexibility in choosing the surface structure and coating for both QCM-D and LSPR. The performance is demonstrated for liquid phase measurements of lipid bilayer formation and biorecognition events, and for gas phase measurements of hydrogen uptake/release by palladium nanoparticles. Advantages of using the combined equipment for biomolecular adsorption studies include synchronized information about structural transformations and extraction of molecular (dry) mass and degree of hydration of the adlayer, which cannot be obtained with the individual techniques. In hydrogen storage studies the combined equipment, allows for synchronized measurements of uptake/release kinetics and quantification of stored hydrogen amounts in nanoparticles and films at practically interesting hydrogen pressures and temperatures.

Nanoplasmonic probes of catalytic reactions
Authors: Larsson, E.M., Langhammer, C., Zoric, I. & Kasemo, B.
Published in: Science
Published: Oct 2009
Abstract: Abstract and full-text version available here.

A nanocell for quartz crystal microbalance and quartz crystal microbalance with dissipation-monitoring sensing
Authors: Ohlsson, G., Langhammer, C., Zoric, I. & Kasemo, B.
Published in: Review of scientific instruments 80, 083905 (2009)
Published: Aug 2009
Abstract: Available here.

Intrinsic Fano Interference of Localized Plasmons in Pd Nanoparticles
Authors: Pakizeh, T., Langhammer, C., Zoric, I., Appell, P. & Käll, M.
Published in: Nano Letters 9, 882-886 (2009)
Published: Jan 2009
Abstract: Available here.

Localized Surface Plasmon Resonances in Aluminum Nanodisks
Authors: Langhammer, C., Schwind, M., Kasemo, B. & Zoric, I.
Published in: Nano Letters 4, 1461-1471 (2008)
Published: Apr 2008
Abstract: Available here.

Plasmon Hybridization in Stacked Double Gold Nanorings with Reduced Symmetry
Authors: Larsson, E. et al.
Published in: Small 10, 1630-1634 (2008)
Published: Jan 2008
Abstract: N/A

Shedding light on dark plasmons in gold nanorings
Authors: Hao, F., Larsson, E., Ali, T., Sutherland, D. & Nordlander, P.
Published in: Chemical Physics Letters 458, 262-266 (2008)
Published: Jan 2008
Abstract: N/A

Hole-Mask Colloidal Lithography
Authors: Fredriksson, H., Alaverdyan, Y., Dmitriev, A., Langhammer, C., Sutherland, D.S., Zäch, M. & Kasemo, B.
Published in: Advanced Materials 19, 4297-4302 (2007)
Published: Nov 2007
Abstract: Available here.

Hydrogen Storage in Pd Nanodisks Characterized with a Novel Nanoplasmonic Sensing Scheme
Authors: Langhammer, C., Zoric, I., Kasemo, B. & Clemens, B.
Published in: Nano Letters 7, 3122-3127 (2007)
Published: Sep 2007
Abstract: Available here.

Absorption and scattering of light by Pt, Pd, Ag, and Au nanodisks: Absolute cross sections and branching ratios
Authors: Langhammer, C., Kasemo, B. & Zoric, I.
Published in: Journal of Chemical Phycis 126, 194702 (2007)
Published: May 2007
Abstract: Available here.

Sensing Characteristics of NIR Localized Surface Plasmon Resonances in Gold Nanorings for Application as Ultrasensitive Biosensors
Authors: Larsson, E., Alegret, J., Käll, M. & Sutherland, D.S.
Published in: Nano Letters 7, 1256-1263 (2007)
Published: Apr 2007
Abstract: Available here.

Plasmonic Properties of Supported Pt and Pd Nanostructures
Authors: Langhammer, C., Yuan, Z., Zoric, I. & Kasemo, B.
Published in: Nano Letters 6, 833-838 (2006)
Published: Apr 2006
Abstract: Available here.