Jaskiran Kaur

The Optical and Chemical Response of Thermal Neutron-Irradiated CR-39 Polymeric Track Detector after Annealing

In the present work, the aliphatic polycarbonate CR-39 with average thickness 260µm was irradiated with different neutron fluences from the Cirus reactor, Bhabha Atomic Research Center, Mumbai. For all samples, the isochronal annealing was done in the temperature zone 130°–150°C, each for 45 min. The effect of annealing on irradiated samples was studied using UV-Visible and FTIR spectroscopic techniques. With UV-Vis analysis, the change in optical band gap and Urbachs energy with annealing for a particular dose have been revealed. The FTIR analysis of irradiated annealed samples indicates the partial repair of bonds on annealing at high temperatures.

Template-Based Synthesis of Nano/Micro Structures on a Semiconducting Substrate

In recent years, nano/micro wires have attracted considerable attention because of their extraordinary physical properties and enormous potential for applications in numerous fields of research and technology. Among the methods widely used to create nanowires, electrochemical deposition in the pores of ion-track polymer membranes have turned out to be very suitable. This method may also be used to synthesize nano/micro structures on the substrate itself to prevent post-synthesis manipulations. For this, the polycarbonate layer is spin coated on the semiconducting substrate and then irradiated with heavy ions. Chemical etching of these latent tracks leads to the formation of nano-/micro-size pores. After depositing metal in these pores, the polycarbonate templates are removed by dissolving them in dichloromethane, leading to the formation of nanowires standing on the substrate itself. Using this technique, we have studied VI characteristics of metallic nano/micro wires grown on the silicon substrate. These nano/micro structures show Schottky behavior when forward biased and ohmic behavior when reversed biased.

Study of Variation in Pore Diameter with Etching Rate and Fabrication of Copper Nano/Micro Wires Using Electrodeposition Method

In the present work, polycarbonate (Makrofol KG) foils of thickness 10 µm were irradiated with Ag+13 ions (180 MeV) at a fluence of 2E7 ions/cm2. Damages created by ion passage (called the latent tracks) in films were later chemically etched in an aqueous solution of 6 N NaOH solution. Scanning electron microscopy (SEM) images of the so created etched tracks shows the increase in diameter of pores with increasing etch-time. These etched track membranes were later successfully used as template for deposition of copper nano/micro wires via electrodeposition method.

Synthetic Ionophores. Part 17. Synthesis of Ether-Amine-Amide Based m-Cyclophanes: A Search for Pb2+ Selective Ionophores

Abstractm-Cyclophanes 3, 4, and 5 possessing two ether oxygen, two amide, one NH and a π-system, an optimal combination of ligating sites for selective Pb2+ binding, have been synthesized by condensations of diethylenetriamine, 3,3′-diaminodipropylamine and 1,3-diaminopropane with 1,3-bis(ethoxycarbonylmethoxy) benzene (6) formed by the PTC reaction of resorcinol and ethyl chloroacetate. Ionophores 3-5 induced cation extraction/transport could not be studied due to their insolubility in CHCl3/CH2Cl2 and solubility in water, but 13CNMR titrations of 4 with metal ions point to its binding preferences for Ag+ and Pb2+ over alkali/alkaline earth cations.

Nano-/micro metallic wire synthesis on Si substrate and their characterization

Nano-/micro wires of copper are grown on semiconducting Si substrate using the template method. It involves the irradiation of 8 um thick polymeric layer coated on Si with150 MeV Ni ion beam at a fluence of 2E8. Later, by using the simple technique of electrodeposition, copper nano-/micro wires were grown via template synthesis. Synthesized wires were morphologically characterized using SEM and electrical characterization was carried out by finding I-V plot.

Ion beam-assisted template synthesis of nanowires on semiconducting substrate

In this paper, we have studied the electrical properties of the randomly distributed metallic (Cu, Ni and Fe) nano-/micro wires on the silicon substrate. Deposition was carried out potentiostatically into the pores of the track-etch polycarbonate membrane spin coated onto the Si substrate. Spin coated films were irradiated with 150 MeV Ni (+11) ions at a fluence of 5E8 ions/cm2, followed by Ultra-Violet (UV) irradiation and chemically etching in aqueous NaOH (6N, at room temperature). The size, shape and morphology of the synthesized nano-/micro structures is strongly dependent on the preparation conditions such as deposition potential, current density, electrolyte and etching conditions. Later, morphological and electrical properties of the so-deposited nano-/micro structures were studied.

Field emission and I–V characteristics of template synthesised nickel nanowires on semiconducting substrate

Ion track technology makes it possible to produce a low cost template for the synthesis of nanowires. In this article, spin-coated polycarbonate films have been irradiated by energetic 150 MeV Ni ion at a fluence of 8E7, followed by UV irradiation and chemical etching in aqueous NaOH (6N, 29°C). Ni nanowires were electrochemically synthesised in the pores created in the polycarbonate film. The nanostructures thus synthesised were morphologically analysed using scanning electron microscopy and further studied for their electrical and field emission properties.