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Su, J., Gherasimova, M., Cui, G., Tsukamoto, H., Han, J., Onuma, T., Kurimoto, M., Chichibu, S. F., Broadbridge, C., He, Y., & Nurmikko, A. V. (2005). Growth of AlGaN nanowires by metalorganic chemical vapor deposition. Applied Physics Letters, 87(18), 183108. https://doi.org/10.1063/1.2126113

Growth of ternary AlGaN nanowires using metalorganic chemical vapor deposition is investigated. Structural, chemical, and optical characterization at nanoscopic scale is carried out by high resolution transmission electron microscopy, x-ray energy dispersive spectroscopy, and spatially resolved cathodoluminescence. Spontaneous formation of Al (Ga) NGaN coaxial nanowires with distinct emission at 370 nm is observed. It is identified that the interplay between surface kinetics and thermodynamics facilitates the catalytic growth of GaN core while a limited surface diffusion of Al adatoms leads to nonselective, vapor-solid growth of Al(Ga)N sheath. The observation points to a fundamental difference in nanosynthesis using near-equilibrium and nonequilibrium techniques. © 2005 American Institute of Physics.

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Calvin, S., Luo, S., Caragianisbroadbridge, C., Mcguinness, J. K., Anderson, E., Lehman, A., Wee, K. H., Morrison, S. A., & Kurihara, L. K. (2005). Comparison of extended x-ray absorption fine structure and Scherrer analysis of x-ray diffraction as methods for determining mean sizes of polydisperse nanoparticles. Applied Physics Letters, 87(23), 233102. https://doi.org/10.1063/1.2137872

Curve fitting of extended x-ray absorption fine structure (EXAFS) spectra, transmission electron microscopy (TEM) imaging, and Scherrer analysis of x-ray diffraction (XRD) are compared as methods for determining the mean crystallite size in polydisperse samples of platinum nanoparticles. By applying the techniques to mixtures of pure samples, it is found that EXAFS correctly determines the relative mean sizes of these polydisperse samples, while XRD tends to be weighted more toward the largest crystallites in the sample. Results for TEM are not clear cut, due to polycrystallinity and aggregation, but are consistent with the other results. © 2005 American Institute of Physics.

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Cummings, K. (2005). Conceptual Underpinnings of Students’ Ability to Understand Reflections from a Plane Mirror. AIP Conference Proceedings, 790, 185–188. https://doi.org/10.1063/1.2084732

In this paper we explore students' pre-instruction knowledge of several conceptual and procedural pieces of knowledge that we believe are prerequisite to one's ability to generate correct light ray diagrams and understand image formation by a plane mirror. The research population is an algebra-based, introductory physics class of about 50 students at a medium-sized, urban, public university. Both individual interviews and written free response questions were used to gather data. © 2005 American Institute of Physics.

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Fitzsimmons, R., Koekkoek, R., Caragianis-Broadbridge, C., Lehman, A., & Cummings, K. (2005). An exploration of microscopy for educational applications in the high school classroom. MRS Proceedings, 909, 80–85. https://doi.org/10.1557/PROC-0909-PP03-17

This project was initiated with an undergraduate student's exploration of two advanced research tools: the scanning electron microscope (SEM) and the atomic force microscope (AFM). A research project was developed to study the application of microscopy to introductory physics instruction, Nine modules covering various aspects of introductory physics were created. Module components included discussions, laboratory experiments and assessments. Four of the nine modules were implemented in various high school classes. Assessments were used to compare student learning with the modules versus standard textbook/lecture techniques, Preliminary results of this study are presented along with recently developed methods created to facilitate implementation of these modules within the high school classroom. © 2006 Materials Research Society.

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Guisti Braislin, M. A., & Cascella, P. W. (2005). A preliminary investigation of the efficacy of oral motor exercises for children with mild articulation disorders. International Journal of Rehabilitation Research, 28(3), 263–266. Scopus. https://doi.org/10.1097/00004356-200509000-00010

Although oral motor therapy is sometimes used to treat articulation disorders in school-age children, several reports question its efficacy. In this case study, four first-grade students, two boys and two girls, received 15 half-hour sessions of oral motor treatment based on Easy Does it for Articulation: An Oral Motor Approach (). Pre- and post-test measures of the children's articulation indicated no real differences in speech production. These results question the efficacy of general and discrete oral motor exercises because they did not enhance the children's speech production. © 2005 Lippincott Williams & Wilkins.

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Su, J., Cui, G., Gherasimova, M., Tsukamoto, H., Han, J., Ciuparu, D., Lim, S., Pfefferle, L. D., He, Y., Nurmikko, A. V., Broadbridge, C., & Lehman, A. H. (2005). Catalytic growth of group III-nitride nanowires and nanostructures by metalorganic chemical vapor deposition. Applied Physics Letters, 86(1), 13105. https://doi.org/10.1063/1.1843281

We report flexible synthesis of group III-nitride nanowires and nanostructures by metalorganic chemical vapor deposition (MOCVD) via a catalytic vapor-liquid-solid (VLS) growth mechanism. Supersaturation and surface stoichiometry strongly influence the stability of liquid droplets and growth selectivity. To facilitate and sustain the VLS growth, indium catalyst is introduced based on thermodynamic consideration. The employment of mesoporous molecular sieves (MCM-41) helps to prevent the coalescence of catalyst droplets and to promote nucleation statistics. Both GaN and AlN nanowires have been synthesized using MOCVD. Three-dimensional AlNGaN trunk-branch nanostructures are reported to illustrate the versatility of incorporating the VLS mechanism into MOCVD process. © 2005 American Institute of Physics.

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