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Bismuth and complex oxide structures (TE Huber, Howard lead. GL Harris Howard, SD Johnson PGCC)
Highlight: The Huber group has reported the first demonstration of optical detection by thermoelectric nanowire junctions. We employed devices composed of bismuth nanowire arrays, which are capped with a transparent indium tin oxide electrode. The incident surface features very low optical reflectivity and enhanced light trapping. The unique attributes of the thermoelectric arrays are the combination of strong temporal and optical wavelength dependences of the photocurrent. Under infrared illumination, the signal can be completely described by thermoelectric effects considering cooling rates given by heat diffusion through the array. Thermoelectric effects are complemented by photovoltaic effects under visible illumination.
A patent has been obtained: “Nanowire bolometer. US2012/0062317A1. Pub. date March 15, 2012. International patent US2012/0062317A1. JP Patent Apln No. 2012-511996. US Patent Application No: 13/321,365. April 29, 2013
"Thermoelectric nanowire junction photoresponse." T.E. Huber, S.D. Johnson, T. Brower, Q. Barclift, B. Panga and G. Harris. MRS Proceedings 1642
“Effect of weak and high magnetic fields in longitudinal and transverse configurations on magnetothermoelectric properties of quantum Bi wires." A. Nikolaeva, L. Konopko, T.E. Huber, G. Para, A. Tsurkan. Surface Engineering and Applied Electrochemistry, Vol.50, No.1 (2014): 57-62.
“Temperature and magnetic dependence of the resistance and thermopower in the topological insulator Bi1−xSbx nanowires." Albina Nikolaeva, Leonid Konopko, Tito E. Huber, Ivan Popov, Pavel Bodiul and Evghenii Moloshnik, Physica Status Solidi (A), 211, 1325-1328 (2014) doi:10.1002/pssa.201300189
"Photoresponse in arrays of thermoelectric nanowire junctions.". T.E. Huber, R. Scott, S. Johnson, T. Brower, J.H. Belk, J. H. Hunt. Applied Physics Letters, 103(4), 041114, (2013). 10.1063/1.4816621
“Thermoelectric nanowire response to illumination”, T.E. Huber, R. Scott, S.Johnson, T. Brower, A. Nikolaeva and L. Konopko. Chapter 17 “Low-dimensional Functional Materials” edited by R. Egger, D. Matrasulov and K. Rakhimov. (E. Huber ) NATO Science for Peace and Security, Series B, Physics and Biophysics 217-224 (2013).
"Thermoelectric prospects of nanomaterials with spin-orbit surface bands," T.E. Huber, K. Owusu, S. Johnson, A. Nikolaeva, L. Konopko, R. C. Johnson, M.J. Graf. J. Appl. Phys. 111, 043709 (2012)
"Quantum interference of surface states in bismuth nanowires in transverse magnetic fields." L.A. Konopko, T.E. Huber, A.A. Nikoleava and L.A Burveacov. J. Low Temperature Physics 171, 677-684 (2013).
"Superconductivity of Bi confined in an opal host." R.C. Johnson, M.D. Nieskoski, S.M. Disseler, T.E. Huber, M.J. Graf. J. Low Temperature Physics 170, 205 (2013).
"Thermoelectric prospects of Bi nanowires." T.E. Huber, K. Owens, S. Johnson, A. Nikolaeva, L. Konopko, M.J. Graf and R..C. Johnson. J. Appl. Physi. 111, 043709 (2012)
"Surface state band mobility and thermopower in semiconducting bismuth nanowires." T.E. Huber, A. Adeyeye, A. Nikolaeva, L. Konopko, R.C. Johnson and M.J. Graf. Phys. Rev. B83, 235414 (2011)
"Quantum Interference in Bismuth nanowires: Evidence for surface charges." L. Konopko, T.E. Huber and A. Nikolaeva. J. Low Temperature Physics 162, 524 (2011).
Growth of reduced dimensional materials (GL Harris, RJ Butcher, JS Matthews (left PRDM 2012) PS Sabila Gallaudet)
"Design, Synthesis and Activity of 2,3-diphosphoglycerate Analogs of Allosteric Modulators of O2 Affinity,” T.W. Kassa, N. Zhang, A.F. Palmer and J.S. Matthews, Artificial Cell, Nanomedicine and Biotechnology, 2013, 1-7.
“bis[Methyl (3-propylamino) but-2-enoato] Zinc,” Olamide O. Onakoya, K.O. Johnson, R.J. Butcher and J.S. Matthews, Acta. Cryst E., E67,
“Metal organic chemical vapordeposition (MOCVD) of ZnO from beta-ketoiminates”, J. Holmes, K. Johnson, B. Zhang, H.E. Katz, and J.S. Matthews. Applied Organometallic Chemistry, 26, 267-272, (2012).
”Current compliance circuit to improve variation in ON State characteristics and to minimize RESET” , P.R. Shrestha, A. Ochia, K.P. Cheung, J.P. Campbell, C.Vaz, J.H. Kima, H. Baumgart,G. Harris, ECS Trans., 50(34) 11-17 (2013):.
”Nanodiamond Foil Product for H- Stripping to Support Spallation Neutron Source (SNS) and Related Applications, RD Vispute, H.K. Ermer, P. Sinsky, A. Seiser, R.W. Shaw, G.Harris, F. Piazza. MRS Fall Proceeding (2013),
”Tris(2,6-dibenzoyl-4-methyl-phenolato-κ(2) O (1),O (2))cobalt(III)”, AK Gupta, S. Srivastava, R. J. Butcher.,Acta Crystallographica Section E: Structure Reports Online, 70, Pt.2 : m67-8 (2014).
”Experimental and computational study on 2,2’-[(1E,2E)-hydrazine-1,2-diylidenedi(1E)eth-1-yl-1-ylidene]diphenol and Its Ni(II), Pt(II), Pd(II) Complexes." S. Alyar, N. Özbek, S. Öztürk Yı ldirim., S. İde, R.J. Butcher. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 130, 198-207 (2014).
”Heterocyclic-2-thione derivatives of silver(I): The methyl substituent at N1atom of a imidazoline-2-thione/Imidazolidine-2-thione alters a dimer [Ag2(HL)4(PPh3)2](NO3)2 into a monomer [Ag(HL)2(PPh3)](NO3).” S. Tarlok, R.S. Lobana,, R.J. Butcher, J.P. Jasinski and T. Akitsu. Zeitschrift für Anorganische und Allgemeine Chemie, 640 1688-1695 DOI: 10.1002/zaac.201400064.(2014)
”Triphenyltellurium chloride." A. Chopra, S. Jain, S.K. Srivastava, S.K. Gupta, R.J. Butcher. Acta Crystallographica Section E: Structure Reports, E70 o421-422 (2014).
”Bis([eta]5-penta-methyl-cyclo-penta-dien-yl)aluminium tetra-bromido-aluminate." A.P. Purdy, C. Dugger, R.J. Butcher,Acta
Crystallographica Section E: Structure Reports Online, E70, Pt.3 m88-9 (2014).
”Synthesis, X-ray structure, electrochemical behaviour and fluorescence studies of mononuclear dioxouranium complexes with
oxygen donor ligands." S.K. Gupta, N. Sen, R.J. Butcher. Polyhedron, 71 : 34-41 (2014).
”Synthesis, characterization and crystal structure of thiadiazoles derived from aroylthiourea." P.D. Singh, P.S. Pratap, R.J. Butcher, S.K. Gupta. Journal of Chemical Crystallography, 71, 34-41 (2014).
”N-(3-Chloro-1,4-dioxo-1,4-di-hydro-naph-thalen-2-yl)-N-propionylpropionamide." N. Idris, R.J. Butcher, O. Bakare. Acta Crystallographica Section E: Structure Reports Online, 70, Pt.2 o102 (2014)
Fabrication of reduced dimensional devices and their properties (SM Gatica, JB Halpern, JW Harkless, KA Stancil KL Jones (associated), TL Brower (associated) Howard C. Sorensen Gallaudet MG Spencer, Cornell)
Highlight: This project, is a collaboration between Kimberly Jones a Howard civil engineering professor specializing in water filtration, Michael Spencer, the PRDM co-PI from Cornell who is an expert in graphene growth and Gary Harris, the PRDM director who is researching diamond film growth. Together with Michelle Chavis, a Cornell PhD whose bachelors degree was from Howard, and is now back at Howard as a post doc and 2013 and 2014 REU students, they have developed a diamond stamp to puncture graphene.
A two dimensional filter presents an opportunity to move beyond traditional polymeric and ceramic membranes to an entirely new class of filters that would enable desalination under high flux, low-pressure conditions. Graphene combines exceedingly large in plane strength with a structure that (without pores) is impervious to molecular flow of any kind. In 2013 as a demonstration, a PRDM REU student, Luke Williams punctured a graphene membrane on Cu with a silicon stamp (left) . Chavis, together with PRDM REU student Anna Kay Barrett, and another REU student WuJoon Cha created a diamond stamp, the AFM scan(right to puncture the graphene. Work needs to be done to reduce the size of the diamond mesas.
The Gatica group is investigating theoretically the properties of various atoms and molecules (noble gases, CO2, NO2, CO, NO, NH3) adsorbed on graphene. The goal is to understand the adsorbate-graphene interactions and the effect of the adsorbed molecules on the conductivity of graphene. This is important for understanding the mechanisms governing graphene gas detectors.
Both a Langmuir model and Monte Carlo simulations have been used to compute the adsorption of Ar, Kr, and Xe on monolayer graphene at low temperatures and construct phase diagrams showing gas-liquid and liquid-solid coexistance lines. The Langmuir model only worked at low coverage. In the next stage the results of Monte Carlo and Molecular Dynamics simulations will be used to study the adsorption of the nitric oxides and ammonia among other molecules. Results will be compared with experimental measurements from the Halpern group to develop a model for theoretically evaluating the sensitivity of graphene gas sensors.
“Contribution of chirality to the adsorption of a Kr atom on a single wall carbon nanotube." Hye-Young Kim, Eric C. Booth, Mamadou T. Mbaye, Silvina M Gatica. Journal of Low Temperature Physics, 175, 590-603 (2014)
"Evaporation Assisted CdSe Nanorod Alignment in Microchannels." K. A. Stancil, International Journal of Engineering Research and Technology, 3(2), 2278-0181 (2014)
“Simulations of adsorption of CO2 and CH4 in MOFs: effect of the size and charge distribution on the selectivity”, Sidi Maiga, Mayra Medina Oluwaseyitan Durodola and Silvina M. Gatica; J. of Low Temperature Physics, 10.1007/s10909-013-0864-z (2013),
"Thermal effects associated with the raman spectroscopy of WO3 gas-sensor materials." R.F. Garcia-Sanchez, T. Ahmido, D. Casimir, S. Baliga, P. Misra. Journal of Physical Chemistry A, 117(50) 13825-13831 (2013).
”Surface modification of porous alumina membranes by collagen layers: Performance and characterization. “, R. Malaisamy, L.i Lepak, M.l Spencer, K. L. Jones. Separation and Purification Technology,.115, 114-122, (2013).
“SPR Studies of the Adsorption of Silver/Bovine Serum Albumin Nanoparticles ( Ag/BSA NPs) onto the Model Biological Substrates, C. Bhan, T.L. Brower, and D. Raghavan. Journal of Colloid and Interface Science. 402, 40-49 (2013).
“Soft Matter: Using Polymer Gels as Building Blocks for Photonic Crystals and Metamaterials”, 84th Annual National Technical
Association Conference Journal "Connecting to Technology-A Must for the Future" September 19 - 21, 2012
Education (Sinex, lead, TL Chambers (associated) PGCC JB Halpern Howard)
"General Chemistry, An Atoms First Approach." J.B. Halpern, Chemwiki (2014)
"Materials, measurement and error: Comparative class data and scientific argumentation via a cloud based application." S.A. Sinex, T.L. Chambers, J.B. Halpern. MRS Proceedings 1657 10.1557/opl2013.371 (2014).
"Developing Online Collaboration Skills in the General Chemistry Laboratory." S.A. Sinex,T.L Chambers. J. Chem. Educ. 90 (9), 1244-1246 (2013).
"Investigating and Visualizing Measurement Error for Novice "STEM” Learners." S.A. Sinex. Proceedings of the Spring 2013 Mid-Atlantic Section Conference of the American Society of Engineering Education, 222-234.(2013)
"Fostering a conceptual understading in undergraduate materials education: A multivariable animated spreadsheet approach." S.A. Sinex, J.B. Halpern. MRS Proceedings 1320, 10.1557/opl2011.637 (2011).