Functional Nanomaterials: Functional Low-Dimensional (0D, 1D, 2D) Materials 2022: Poster Session
Sponsored by: TMS Functional Materials Division, TMS: Nanomaterials Committee
Program Organizers: Michael Cai Wang, University of South Florida; Yong Lin Kong, University of Utah; Sarah Ying Zhong, University of South Florida; Surojit Gupta, University of North Dakota; Nasrin Hooshmand, Georgia Institute of Technology; Woochul Lee, University of Hawaii at Manoa; Min-Kyu Song, Washington State University; Simona Hunyadi Murph, Savannah River National Laboratory; Hagar Labouta, University of Manitoba; Max Anikovskiy, University of Calgary; Patrick Ward, Savannah River National Laboratory

Monday 5:30 PM
February 28, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center

NOW ON-DEMAND ONLY – H-8: Hydrothermal Synthesis of ZnO Nanorod Arrays for Gas Sensing: P. Kojo Amoah1; Jordan Shields2; Helmut Baumgart1; Y.S. Obeng3; Abdelmageed Elmustafa1; 1Old Dominion University; 2College of William and Mary; 3National Institute of Standards and Technology
    Obtaining controllable growth of ordered single crystal nanorods for specific device applications, such as in gas sensors and detectors represents a significant challenge. Among all the available numerous methods, hydrothermal growth of ZnO nanorod arrays is the most energy-efficient and economical, environmentally friendly fabrication technique that does not require a complex vacuum system. In this work, we report on hydrothermal growth of well-aligned ZnO nanorod arrays perpendicularly oriented on substrates. ZnO seed layers were prepared on Si by atomic layer deposition (ALD). In the ALD process, Dimethyl zinc and water were used as precursors of ZnO seed layer. The growth temperature of ZnO layer was 150oC. The ZnO nanorods arrays were achieved from a fine grain ZnO seed layer by means of heating an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine in a water bath at low temperature in the range of 65 - 90°C.

H-9: Strain-induced Reversible Phase Transitions in 2D Transition Metal Dichalcogenides: Zhewen Yin1; Anjun Hu1; Md Rubayat-E Tanjil1; Ossie Douglas1; Mahabubur Rahman2; Huijuan Zhao2; Michael Cai Wang1; 1University of South Florida; 2Clemson University
    Two-dimensional (2D) transition metal dichalcogenides (TMDCs) exhibit more than one metastable crystal phase (e.g., semiconducting 2H phase and the metallic 1T’phase) with distinct structures, symmetries, and physical properties, leading to emergent physics and associated applications. To date, various routes have been conceived to induce phase transitions between H- and T-/T’- phases, most of which are irreversible or destructive. We demonstrate a reversible way to realize the cyclic phase transformation of TMDCs via elastomer-assisted elastic strain engineering. In-plane tensile and compressive stresses are applied to TMDC monolayers through dangling bonds and chemical bonds at the 2D/elastomer interface. This enables a reversible and relatively high ε strain engineering approach for 2D materials while allowing in situ monitoring of the strain-induced phase transition via Raman and photoluminescence spectroscopy. The simplicity of our strategy and its generalizability to different TMDCs generate new possibilities for the phase engineering of low-dimensional materials.

H-10: The Interaction Dynamics and Binding Strength of Proteins on Gold Nanoparticles: Tushar Upreti1; 1University of Manitoba
    Gold Nanoparticles (AuNP) have been touted for their high diagnostic and treatment potential. However, to predict the fate of NPs in biological milieu, we need to understand the interaction of AuNPs with vascular and extravascular proteins upon intravenous (IV) or intradermal (ID) administration, respectively. To investigate this protein-AuNP interaction, we first synthesized AuNP of two sizes (24nm and 38nm) using the citrate reduction technique. AuNPs were then exposed to either albumin or collagen individually, or sequentially to simulate IV and ID administration. UV-Vis and fluorescence spectroscopy combined with mathematical modeling was used to evaluate the protein-NP interaction. The results from this study show that the nature of protein-NP interaction is dynamic, and collagen has a higher binding affinity than albumin. Our study presents convincing data to suggest that the precoating of NPs with strong affinity proteins, such as collagen, confers predictive in vivo behaviour and greater NP stability.