IUPUI Research Day 2013

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https://hdl.handle.net/1805/4887
A program book describing the Research Day 2013 events and posters is available from: http://hdl.handle.net/1805/4914.

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Browsing IUPUI Research Day 2013 by Author "Agarwal, Mangilal"

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    Layer-By-Layer Self-Assembly of CIGS Nanoparticles and Polymers for All-Solution Processable Low-Cost, High-Efficiency Solar Cells
    (Office of the Vice Chancellor for Research, 2013-04-05) Ho, Tung; Vittoe, Robert; Kakumanu, Namratha; Shrestha, Sudhir; Agarwal, Mangilal; Varahramyan, Kody
    Thin film solar cells made from copper indium gallium selenide (CIGS) materials have shown great potentials of providing low cost, high efficiency panels viable for wide spread commercial usage. Layer-by-layer (LbL) self-assembly is a low-cost, versatile nanofilm deposition process, however introduces polymers in the nanoparticles films, which reduces charge transport thereby affecting solar cell efficiency. This research aims to study various polymer materials to replace currently used insulating polymers in LbL, such as poly(sodium-4-styrenesulfonate) (PSS) and polyethyenimine (PEI). This poster will present processes and results of CIGS nanoparticles synthesis using controlled heating of CuCl, InCl3, GaCl3, and Se in oleyamine; functionalization of the particles to disperse in organic and aqueous-based solvents for LbL; and initial outcomes of CIGS, polymers LbL film fabrication and characterization. The size distribution of synthesized nanoparticles cleaned through alternate suspension and precipitation in chloroform and ethanol shows a peak at 72 nm. Particles light absorption properties measured with ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy shows good spectrum coverage with band edge near 1100 nm. The X-ray diffraction (XRD) results of the particles confirms the composition and tetragonal chalcopyrite crystal structure of CIGS materials. Chemical-bath-deposition of cadmium sulfide (CdS) and spray-coating of zinc oxide (ZnO) films are used along with LbL absorbing film in realization of a solar cell device. The fabricated devices are tested using semiconductor characterization instrument.
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    Low-Power ASIC Design for Multiple Integrated Sensors Applications
    (Office of the Vice Chancellor for Research, 2013-04-05) Jafarian, Hossein; Daneshkhah, Ali; Shrestha, Sudhir; Agarwal, Mangilal; Rizkalla, Maher; Varahramyan, Kody
    The aim of this work is to develop sensor integrated low-power chip for biomedical and other applications. Complementary metal-oxide-semiconductor (CMOS) technology in integrated circuit (IC) design has been applied to develop application specific integrated circuits (ASIC). An ASIC design that includes analog and digital sub-systems for various applications forming a system on chip (SoC) is presented. The analog sub-system drives multiple sensors, while the digital sub-system manages power, sensors, and signal output. A frequency of the pulse signals generated by the analog sub-system depends on the input voltage, which in-turn varies with sensor parameters. The frequency change of 750 MHz to 1 GHz was observed for input voltage variations of 1.2 to 2.2 V, with sensitivity of 10 mV. A separate temperature sensor included in the analog sub-system demonstrated frequency change of 830 to 440 MHz for temperature variations of ˗50°C to 100°C with resolution of 1°C. The output signal in digital sub-system is generated by counting the input pulses for each clock which has ‘on-state’ of only 3/16 seconds. This results in a significant reduction in the power consumption. This poster presents and discusses the system design and simulation results.
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    Nanotechnology Research, Education, and Outreach by the Integrated Nanosystems Development Institute (INDI)
    (Office of the Vice Chancellor for Research, 2013-04-05) Naumann, Christoph A.; Rizkalla, Maher; Decca, Ricardo; El-Mounayri, Hazim; Witzmann, Frank; Agarwal, Mangilal
    Through multidisciplinary research and novel educational programing, the Integrated Nanosystems Development Institute (INDI) is sponsored under IUPUI’s Signature Center Initiative to advance nanotechnology-based systems research and spark student interest in this emerging STEM field. Innovation in the field of nanotechnology arises from interdisciplinary approaches and INDI draws on the expertise of faculty across departments and schools (including the School of Engineering and Technology, School of Science, School of Dentistry, and School of Medicine) in order to fuel research collaborations and offer nanosystems coursework to both science and engineering students. Current research efforts are focused in INDI’s thrust areas of bionanotechnology and sustainable nanoenergy, which build on the existing strengths of participating schools and span a range of critical issues in nanomaterials, nanodevices, nanosystems, energy, physics, and nanomedicine. Examples of research include the development of artificial biomaterials, toxicology of nanomaterials, and the development of nanomanufacturing techniques and educational tools. INDI facilitates research efforts by identifying funding opportunities, establishing research teams, offering seed funding, and providing a cluster of analytical equipment, characterization tools, and lab resources that support the work of faculty and student researchers. Aside from research, INDI plays a vital role in nanotechnology curriculum development on campus, in particular, the design and implementation of coursework offered within IUPUI’s newly developed Nanotechnology Track and Energy Engineering degree program. This academic track provides students with both theory and hands-on experiences involving the fabrication, characterization, and applications of nanomaterials, nanodevices and nanomedicine. Moreover, INDI’s community outreach activities, including its nanotechnology summer camps for K-12 students and teachers, aim to provide early student exposure and educate teachers in applying nanotechnology modules within their classrooms. These student experiences are designed to encourage higher education in an effort to generate the advanced nanotechnology workforce needed by Indiana and the nation.
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    Paper-Based Lithium-Ion Battery
    (Office of the Vice Chancellor for Research, 2013-04-05) Aliahmad, Nojan; Agarwal, Mangilal; Shrestha, Sudhir; Varahramyan, Kody
    Lithium-ion batteries have a wide range of applications including present day portable consumer electronics and large-scale energy storage. Realization of these batteries in flexible, light-weight forms will further expand the usage in current and future innovative electronic devices. Lithium titanium oxide (Li4Ti5O12), lithium magnesium oxide (LiMn2O4) and lithium cobalt oxide (LiCoO2) materials have been consistently studied for application in high capacity batteries, and thus considered in the devices that are presented in the poster. Carbon nanotube (CNT) coated wood microfiber papers are used as current collectors, which provide high surface area, flexibility, and texture of paper, with low CNT utilization (10.1μg/cm2). The CNT microfiber paper is fabricated by layer-by-layer (LbL) nano-assembly of CNT over cellulose microfibers. Results from paper-based half-cell batteries show capacities of 130 mAh/g for LiMn2O4, 150 mAh/g for LiCoO2, and 158 mAh/g for Li4Ti5O12 at C/5 rate. These results are comparable with metallic electrode based cells. The fabrication of CNT microfiber paper, assembly of batteries, experimental methods, and results are presented and discussed.