2,981 research outputs found
Physical Properties of Vanadium Wadsley Phases and Application for Infrared Transparent Conductor
No full textvanadium dioxide polymorphs; VO2(A); VO2(B); VO2(M) vanadium Wadsley phase (VmO2m+1); VO2; V6O13; V2O5; electronic band structure; infrared transparent conductor.DoctordCollectio
Electrical and optical properties of VO2 polymorphic epitaxial filMaster
No full textVanadium dioxide (VO2) polymorphs have many interesting physical and chemical properties that are crystal-structure dependent. We report that polymorphic (010)VO2(M1), (100)VO2(A), and (100)VO2(B) can be epitaxially grown on (001), (011), and (111) orient-ed Y-stabilized ZrO2 (YSZ), respectively. Although VO2(M1) exhibits a typical metal–insulator transition near 68°C, and VO2(B) behaves as an insulator. And, the resistivity of VO2(A) is three orders of magnitude lower than that of (100)VO2(A) epitaxial filMaster previ-ously grown on (011)SrTiO3. Ellipsometry reveals that the bandgap of VO2(A) also de-creases. Each type of VO2 polymorphic film grown on cost-effective YSZ will be of great interest for numerous electronic and energy applications.|바나듐 이산화물(VO2)은 결정 구조에 따라서 다양한 전기적, 광학적 특성을 보인다. 하지만, 단결정을 만들기 어렵기 때문에 VO2의 본질적인 특성을 연구하는데 제약이 있었다. 우리는 에피 증착법을 이용하여 (001)-, (011)-, (111)-방향의 지르코늄 이산화물(Y-stabilized ZrO2, YSZ) 기판위에 VO2(M1), VO2(A), VO2(B)를 각각 성장하는데 성공하였다. 엑스선 회절기와 전자 투과 현미경을 이용하여 박막의 구조와 결정성을 확인했으며 에피 성장에 대한 박막과 기판 면의 조화를 확인했다. 온도 증가에 따라 VO2(M1)이 68oC 에서 비금속-금속으로 전이하는 특성과 VO2(A)와 VO2(B)가 저항이 단순 증가하는 특성을 관찰하였다. 흥미롭게도 YSZ 위에 에피 증착된 VO2(A)는 SrTiO3 위에 증착된 기존의 에피 박막에 비해서 저항이 1000배 감소하였다. 타원 편광계를 이용하여 순수한 상 각각의 띠틈(bandgap)을 측정하고 전자구조를 제안하였다. 저렴한 YSZ 위의 각각 에피 성장된 VO2 동질이상체에 대한 우리의 연구는 차세대 전자소자와 에너지 응용에 큰 흥미를 끌 것이다.openⅠ. Introduction 1
1.1 General overview of VO2 polymorphs 1
1.2 Epitaxial stabilization of pure VO2 polymorphic phases 2
1.3 Y-stabilized ZrO2 (YSZ): a new substrate for epitaxial growth of pure VO2(M1), VO2(A), and VO2(B) 3
Ⅱ. Experimental Methods 4
2.1 Thin film deposition 4
2.2 Characterization 4
Ⅲ. Results and Discussion 6
3.1 VO2(M1) epitaxial filMaster on (001)YSZ 6
3.2 VO2(A) epitaxial filMaster on (011)YSZ 11
3.3 VO2(B) epitaxial filMaster on (111)YSZ 14
3.4 Electrical properties of pure VO2(M1), VO2(A), and VO2(B) 16
3.5 Optical properties of pure VO2(M1), VO2(A), and VO2(B) 18
Ⅳ. Conclusion 20MASTERdCollectio
High infrared transparency up to 8-μm-wavelength in correlated vanadium Wadsley conductors
No full textWithin industrial and military contexts, research on infrared transparent conductors (IR-TCs) has been limited due to the significant suppression of transparency by the free electron response. In this paper, we report that strong correlations between electrons play an important role in the development of a new strategy for fabricating IR-TCs. Metallic VO2(B) and V6O13 persistently exhibit transmittances 45% higher than that of Sn-doped In2O3 for a broad IR wavelength range of up to 8 μm. Based on electronic band structures determined quantitatively using x-ray absorption spectroscopy, x-ray photoemission spectroscopy, and spectroscopic ellipsometry, we propose that the enhancement in the IR-TC is attributed to the redshift of the plasma frequency induced by the correlated electrons. © 2020 Author(s).1
Electrical and Optical Properties of VO2 Polymorphic Films Grown Epitaxially on Y-Stabilized ZrO2
No full textVanadium dioxide (VO2) polymorphs have many interesting physical and chemical properties that are crystal-structure dependent. It is reported that polymorphic (010) VO2(M1), (100) VO2(A), and (100) VO2(B) can be epitaxially grown on (001)-, (011)-, and (111)-oriented Y-stabilized ZrO2 (YSZ), respectively. While VO2(M1) shows a typical metal-insulator transition near 68 degrees C, and VO2(B) exhibits insulating behavior, the resistivity of VO2(A) is lower by three orders of magnitude than that of (100) VO2(A) epitaxial films previously grown on (011) SrTiO3. Ellipsometry reveals that the bandgap of VO2(A) also decreases. Each VO2 polymorphic film grown on cost-effective YSZ will be of great interest for numerous electronic and energy applications © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei
Franny Choi, 41st Annual ODU Literary Festival
No full textFranny Choi is a queer, Korean-American poet, playwright, teacher, organizer, pottymouth, GryffinClaw, and general overachiever. She is the author of Floating, Brilliant, Gone (2014), and a chapbook, Death by Sex Machine (2017). She has received awards from the Poetry Foundation and the Helen Zell Writers Program, as well as fellowships from the Vermont Studio Center and the Rhode Island State Council on the Arts. Her poems have appeared in journals including Poetry magazine, American Poetry Review, New England Review, and her work has been featured by the Huffington Post, PBS NewsHour, and Angry Asian Man
QJE-STD-18-253.R2-Supplementary_Material – Supplemental material for Development and assessment of the Korean Author Recognition Test
No full textSupplemental material, QJE-STD-18-253.R2-Supplementary_Material for Development and assessment of the Korean Author Recognition Test by Hyosun Lee, Eunjin Seong, Wonil Choi and Matthew W Lowder in Quarterly Journal of Experimental Psychology</p
From the Margins to the Forefront: Tillie Olsen's Mediation as Figure and Author
No full text45 pg.Tillie Olsen's life experiences and self-identification as a working class woman provide a strong basis for analyzing her fiction as partly autobiographical. As she wrote, she developed her position as a recognized and award winning author into that of a literary mediator for socially marginalized subjects, actively working to represent certain conditions of exclusion due to social, racial, economic, and sexual factors during the 1970's and 1980's. Through analysis of her fiction and non-fiction texts, her use of modernist writing techniques, her purpose as a writer, and her impact on the literary canon, it becomes possible to see how she has altered the literary landscape and has made those who suffer exclusion visible and legible.Advisor(s): Choi, Helen . Committee Member(s): Marshik, Celia.Stony Brook University Libraries. SBU Graduate School in Department of English. Charles Taber (Dean of Graduate School)
Replicating “Predicting the present with Google trends” by Hyunyoung Choi and Hal Varian (The Economic Record, 2012)
No full textIn this note, the author describes different ways one could try to replicate Choi and Varian (Predicting the present with Google trends, The Economic Record, 2012)
Replicating "Predicting the present with Google trends" by Hyunyoung Choi and Hal Varian (The Economic Record, 2012)
No full textIn this note, the author describes different ways one could try to replicate Choi and Varian (Predicting the present with Google trends, The Economic Record, 2012)
Replicating “Predicting the present with Google trends” by Hyunyoung Choi and Hal Varian (The Economic Record, 2012)
No full textIn this note, the author describes different ways one could try to replicate Choi and Varian (Predicting the present with Google trends, The Economic Record, 2012)
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