Hydrogen is considered as one of the most promising energy storage materials for a society based on renewable resources. Due to the high reactivity of hydrogen, highly sensitive sensing devices are required. In this work, the possibilities in increasing the sensitivity of gold-palladium nanoparticles for hydrogen sensing were explored. Two paths were tried: Either increasing the nanoparticles surface area or by increasing the nanoparticles refractive index sensitivity. Porous gold-palladium nanoparticles were created by thermal de-wetting stacks of silver, gold and palladium layers on a quartz substrate and subsequent removal of silver by etching with nitric acid. The porosity was verified using a scanning electron microscope and the chemical composition was determined using energy dispersive X-ray spectroscopy. Etching with nitric acid led to an almost complete removal of silver and palladium. A different etchant, a mixture of ammonium hydroxide and hydrogen peroxide, did not lead to the formation of porous structures due to slower etch rate of silver than for using nitric acid while showing a faster than expected etch rate for palladium. To increase the refractive index sensitivity, nanostar-core and palladium-shell nanoparticles and gold-silver-alloy-core and palladium-shell nanoparticles with various silver concentrations were created wet-chemically and via thermal annealing. Single particle scattering spectra were taken in nitrogen or nitrogen/hydrogen atmosphere using a darkfield microspectroscopy setup. A shift in resonance position in the hydrogen atmosphere was observed. The resonance shift was stronger for gold-silver-alloy cores than for gold cores on glass. Characterisation of individual palladium coated gold-silver-alloy nanospheres showed a blueshift of the plasmon resonance with increasing palladium layer thickness on a glass substrate and a redshift on an ITO substrate. The possible reason is the increase in refractive index sensitivity due to the increase in palladium layer thickness, counteracting the blueshift due to the dielectric function of palladium.