Papers by Moreno Meneghetti
Mechanisms and Key Concepts of Natural and Artificial Systems, 2011
Biosensors and Bioelectronics, 2015
Micro and nanomechanical resonators represent a promising platform for proteins label-free detect... more Micro and nanomechanical resonators represent a promising platform for proteins label-free detection because of their extreme sensitivity, fast response and low cost. Micro-pillars are columnar resonators that can be easily arranged in dense arrays of several thousand sensors in a squared mm. To exploit such a large density, however, a method for tracking independently micropillars resonance frequency is required. Here we present a detection method based on CCD imaging and software image analysis, which can measure the resonance frequency of tens of pillars in parallel. Acquiring simultaneously the frequency shift of up to 40 sensors and applying a proper statistical analysis, we were able to overcome the variability of the single measures improving the device sensitivity at low analyte concentration range. As a proof of concept, this method has been tested for the detection of a tumor marker, the Prostate Specific Membrane Antigen (PSMA). Pillars have been functionalized with an antibody against PSMA. The tumor marker (PSMA) has been detected in a range of concentrations between 300pM and 100nM, in buffer and in diluted bovine serum. The sensitivity of our method was limited only by the affinity constant of the antigen-antibody recognition. Moreover, this detection technique demonstrated to be effective in the 1-6nM range, which is the window of PSMA concentration of clinical interest.
Physical Review B, 2003
Chemical oxidation of single wall carbon nanotubes ͑SWNTs͒, produced with the HiPco method, is st... more Chemical oxidation of single wall carbon nanotubes ͑SWNTs͒, produced with the HiPco method, is studied by resonance Raman scattering. The analysis of the radial breathing mode makes it possible to assign the observed bands to metallic and semiconducting SWNTs and to suggest the chiral indices of SWNTs contributing to the spectra. On this basis we observe that the most important parameter which determines the attack of the nanotubes is their diameter: Small diameter tubes, due to the stress induced by the curvature, are first attacked and destroyed. Some reactivity is also observed for larger diameter metallic nanotubes, which, however, are not easily destroyed.
6th International Topical Conference on Optical Probes of Conjugated Polymers and Biosystems, 2005
Science of Advanced Materials, 2012
Molecular Crystals and Liquid Crystals, 1990
Abstract Some structure-property relationships for conducting LB films based on semiamphiphilic T... more Abstract Some structure-property relationships for conducting LB films based on semiamphiphilic TCNQ salts with closed shell cations are worked out. Formation of a 3-D ordered structure containing (TCNQ−) 2 dimers on the water subphase followed by a remarkable structural rearrangement of deposited films upon iodination is found to be a necessary requirement for conductivity. Among the studied salts, these processes occur only for those with similar cations.
The Journal of Physical Chemistry C, 2014
Photonic Crystal Materials and Devices III, 2006
Polystyrene artificial opals are directly grown with embedded gold nanoparticles (NpAu) in their ... more Polystyrene artificial opals are directly grown with embedded gold nanoparticles (NpAu) in their interstices. Reflectance spectra of samples having different sphere diameters and nanoparticles load clearly show a red shift of the photonic band gap as well as a reduction of its width without showing direct evidence of NpAu absorption. The case of transmission spectra is instead more complicated: here, overlapped to a broad NpAu absorption, a structure having unusual lineshape is detected. The infiltration of opal with NpAu removes the polarization dependence of the photonic band structure observed in bare opals. The lineshape of the absorption spectra suggest a spatial localization of the electromagnetic field in the volume where NpAu are confined thus enhancing its local intensity. This effect seems to be effective to stimulate optical nonlinearities of NpAu. Nanosecond transient absorption measurements on NpAu infiltrated opals indicate that a variation of transmission of about 10% is observed. Since this effect takes place within the pump pulse and since NpAu photoluminescence has been subtracted to the signal, we attribute it to an optical switching process.
Comprehensive Analytical Chemistry, 2014
Synthetic Metals, 2003
Résumé/Abstract Non linear transmission measurements with nanosecond pulses at 532 nm are present... more Résumé/Abstract Non linear transmission measurements with nanosecond pulses at 532 nm are presented for fulleropyrrolidines, PEG-single-walled-nanotubes and for TMTTF. Besides a reverse saturahle absorption (RSA) we find, for fulleropyrrolidines, a non-linear scantering activity related to the formation of triplet excitons, whereas for the soluble nanotubes an RSA activity seems to he present in addition to the non-linear scattering, characteristic of suspensions of original nanotubes. TMTTF solutions show the importance ...
Soft Matter, 2008
Stable homogeneous aqueous dispersions of pristine single-walled carbon nanotubes (SWNTs) are obt... more Stable homogeneous aqueous dispersions of pristine single-walled carbon nanotubes (SWNTs) are obtained by using a water-soluble long-chain imidazolium ionic liquid (hvimBr) above its critical micelle concentration. The amount of hivmBr and the sonication time are two essential factors to obtain a good dispersion. The effective concentration of exfoliated SWNTs in aqueous solution is determined by simple, convenient and rapid UV-visible spectrophotometric measurements.
Materials and Devices for Photonic Circuits, 1999
ABSTRACT We report the synthesis of sol-gel materials based on highly efficient heterocycle-based... more ABSTRACT We report the synthesis of sol-gel materials based on highly efficient heterocycle-based push-pull chromophores showing second- and third-order nonlinear optical activity. We show the proper functionalization of the best performing chromophores and their incorporation into a hybrid organic- inorganic sol-gel matrix. Different types of functionalization of the active molecule have been considered, including hydroxyl and alkoxysilyl end-groups. The functionalization strategy responded to different criteria such as stability and synthetic availability of the final molecular precursors, their solubility, and the used synthetic approach to the sol-gel material. The synthesis of the sol-gel materials has been tuned in order to preserve molecular properties and control important factors such as final concentration of the active dye in the matrix. Both acid- and base-catalyzed sol-gel synthesis has been taken into account. 3-Glycidoxypropyltrimethoxysilane and 3- aminopropyltriethoxysilane have been used as the organically modified alkoxides to prepare the hybrid organic-inorganic matrix. Characterization of the spectroscopic properties of the sol-gel materials is presented.
Synthetic Metals - SYNTHET METAL, 1988
Abstract A comprehensive approach to the analysis of the infrared data of a quarter-filled, sligh... more Abstract A comprehensive approach to the analysis of the infrared data of a quarter-filled, slightly dimerized organic molecular conductor characterized by narrow optical gaps is proposed. It is based on a model for a one-dimensional molecular chain system with twofold-commensurate charge-density-waves. Analysis of the room temperature infrared spectra of (TMTSF) 2 ClO 4 indicates the presence of electronic correlations strong enough as to effectively exclude the double occupancy of the electronic states. Other important ...
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Papers by Moreno Meneghetti