Articles you may be interested inResonance-mode effect on microcantilever mass-sensing performance in air Rev. Sci. Instrum. 79, 074301 (2008);This work is focused on the developing of silicon resonant microcantilevers for the measurement of the absolute pressure. The microcantilevers have been fabricated with a two-mask bulk micromachining process. The variation in resonance response of microcantilevers was investigated as a function of pressure ͑10 −1 -10 5 Pa͒, both in terms of resonance frequency and quality factor. A theoretical description of the resonating microstructure is given according to different molecular and viscous regimes. Also a brief discussion on the different quality factors contributions is presented. Theoretical and experimental data show a very satisfying agreement. The microstructure behavior demonstrates a certain sensitivity over a six decade range and the potential evolution of an absolute pressure sensor working in the same range.

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We report on the fabrication of desired magneto-photonic devices by a low one-photon absorption (LOPA) direct laser writing (DLW) technique on a photocurable nanocomposite consisting of magnetite (normalFe3normalO4) nanoparticles and a commercial SU-8 photoresist. The magnetic nanocomposite was synthesized by mixing normalFe3normalO4 nanoparticles with different kinds of SU-8 photoresists. We demonstrated that the degree of dispersion of normalFe3normalO4 nanoparticles in the nanocomposite depended on the concentration of normalFe3normalO4 nanoparticles, the viscosity of SU-8 resist, and the mixing time. By tuning these parameters, the most homogeneous magnetic nanocomposite was obtained with a concentration of about 2 wt % of normalFe3normalO4 nanoparticles in SU-8 2005 photoresist for the mixing time of 20 days. The LOPA-based DLW technique was employed to fabricate on demand various magneto-photonic submicrometer structures, which are similar to those obtained without normalFe3normalO4 nanoparticles. The magneto-photonic 2D and 3D structures with sizes as small as 150 nm were created. We demonstrated the strong magnetic field responses of the magneto-photonic nanostructures and their use as micro-actuators when immersed in a liquid solution.

In this paper, silver (Ag) nanoclusters-loaded graphitic carbon nitride (g-C 3 N 4 ) nanosheets are synthesized and their physical properties as well as photocatalytic activities are systematically investigated by different techniques. The existence of Ag atoms in the form of nanoclusters (NCs) rather than well-crystallized nanoparticles are evidenced by X-ray diffraction patterns, SEM images, and XPS spectra. The deposition of Ag nanoclusters on the surface of g-C 3 N 4 nanosheets affect the crystal structure and slightly reduce the band gap energy of g-C 3 N 4 . The sharp decrease of photoluminescence intensity indicates that g-C 3 N 4 /Ag heterojunctions successfully prevent the recombination of photo-generated electrons and holes. The photocatalytic activities of as-synthesized photocatalysts are demonstrated through the degradation of rhodamine B (RhB) solutions under Xenon lamp irradiation. It is demonstrated that the photocatalytic activity depends strongly on the molar concentration of Ag + in the starting solution. The g-C 3 N 4 /Ag heterojunctions prepared from 0.01 M of Ag + starting solution exhibit the highest photocatalytic efficiency and allow 100% degradation of RhB after being exposed for 60 min under a Xenon lamp irradiation, which is four times faster than that of pure g-C 3 N 4 nanosheets.