Realization and characterization of graphitic contacts on diamond by means of laser

This work deals with the realization and characterization of integrated graphitic contacts on diamond by means of laser irradiation (graphitization), in order to obtain good quality ohmic electrodes for nuclear radiation detectors to be used in high energy physics experiments. Unlike the conventional method used for the electrode production, which requires numerous steps and very well controlled environmental conditions, this alternative technique presents many advantages: the contacts are realized in air at room temperature in a single step. In this study, the characteristics of several graphitic structures realized on a diamond surface by changing the radiation-matter interaction parameters have been evaluated in order to define the best experimental conditions to create graphitic electrodes with low resistivity. The obtained results are promising: contacts perfectly adherent, with good charge collection properties, stable and resistant to ionizing radiation

Diamond detectors with electrodes graphitized by means of laser

In the last years there has been an increase of interest in diamond devices because of the promising applications in different field, such as high-energy physics, radiotherapy and biochemical applications. In particular, a new frontier is represented by the realization of full-carbon detectors characterized by graphite electrodes, which give to the devices considerable advantages like high radiation hardness, perfect mechanical adhesion and good charge collection properties. In this paper the manufacturing of full-carbon devices and their detection performances are illustrated and compared to a reference diamond detector characterized by traditional electrodes

Colloidal lithography fabrication of tunable plasmonic nanostructures

In the last years, many studies have been performed on metal nanoparticles because of their possible applications as chemical and biological sensors [1]. Particularly, new design and fabrication strategy of plasmonic transductors have been proposed in order to enhance their sensing performances and reproducibility. Unfortunately, the most used fabrication methods for metallic nanostructured systems, such as EBL and FIB, are less accessible choices for scientists and industrial applications due to their critical drawbacks, like low speed and high-cost

Low cost lithographic fabrication of tunable plasmonic nanostructures

none8noneColombelli, A.; Manera, M.G.; Primiceri, E.; Taurino, A.; Rizzato, S.; Monteduro Anna Grazia; Maruccio, G.; Rella, R.Colombelli, A.; Manera, M. G.; Primiceri, E.; Taurino, A.; Rizzato, S.; Monteduro, ANNA GRAZIA; Maruccio, G.; Rella, R

Simultaneous detection of multiple lower genital tract pathogens by an impedimetric immunochip

Lower genital tract infections caused by both sexually and not-sexually transmitted pathogens in women are a key public health priority worldwide, especially in developing countries. Since standard analyses are time-consuming, appropriate therapeutic intervention is often neglected or delayed. Lab-on-chips and biosensors open new perspectives and offer innovative tools to simplify the diagnosis by medical staff, especially in countries with inadequate resources. Here we report a biosensing platform based on Electrochemical Impedance Spectroscopy (EIS) that allows multiplexed detection of Candida albicans, Streptococcus agalactiae and Chlamydia trachomatis with a single biochip, enabling a quick screening thanks to the presence of different immobilized antibodies, each specific for one of the different target pathogens

Characterization of surface graphitic electrodes made by excimer laser on CVD diamond

In this work graphitic structures were fabricated on high quality polycrystalline CVD diamond by using a UV laser beam (lambda = 193 nm). Two different kinds of structures were realized on diamond to study the evolution from diamond to graphite at different irradiation conditions (spot like structures) and to study their electrical transport properties (strip like structures). The graphitic structures were characterized structurally and morphologically by micro-Raman spectroscopy and atomic force microscopy. The electrical properties were evaluated using the transmission line model. Finally, a full carbon detector was built and tested showing good nuclear detection properties