Sensitive detection of H2S using gold nanoparticle decorated single-walled carbon nanotubes.

Herein, we demonstrate that highly sensitive conductometric gas nanosensors for H(2)S can be synthesized by electrodepositing gold nanoparticles on single-walled carbon nanotube (SWNT) networks. Adjusting the electrodeposition conditions allowed for tuning of the size and number of gold nanoparticles deposited. The best H(2)S sensing performance was obtained with discrete gold nanodeposits rather than continuous nanowires. The gas nanosensors could sense H(2)S in air at room temperature with a 3 ppb limit of detection. The sensors were reversible, and increasing the bias voltage reduced the sensor recovery time, probably by local Joule heating. The sensing mechanism is believed to be based on the modulation of the conduction path across the nanotubes emanating from the modulation of electron exchange between the gold and carbon nanotube defect sites when exposed to H(2)S.

Materials for a history of Hungarian academic orientalism: The case of Gyula Germanus

This article provides materials for an institutional history of academic Hungarian Orientalism through the life of Gyula Germanus (1884-1979). Using hitherto unexploited archives, this text explores his education, integration into academia, and career up to 1939. I argue that Germanus was an assimilated Hungarian of Jewish origin with a strong loyalty to the state. His two conversions - to Calvinism in 1909 and to Islam in 1930 - also transformed him from a minor Turkologist into a popularly acclaimed Arabist. This study demonstrates that academic Orientalism as a national science was a contested vehicle of social mobility in the Hungarian transition from an imperial to a nation-state setting.© 2014 koninklijke brill nv, leiden.