Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO2 and V2O3 Nanostructures

Graf, David; Schläfer, Johannes; Garbe, Simon; Klein, Axel; Mathur, Sanjay

doi:10.1021/acs.chemmater.7b01018

Cited by 31 publications

(20 citation statements)

References 58 publications

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“…Recently, the most widely studied thermochromic material is monoclinic (M) phased VO 2 , which can initiate an automatic reversible semiconductor–metal phase transition (SMT) at ≈68 °C ( T c ) . Thermochromic VO 2 coatings have been fabricated by a variety of techniques including chemical vapor deposition (CVD), pulsed laser deposition (PLD), and magnetron sputtering (MS), hydrothermal process, sol‐gel method, etc. From an application perspective, it is crucial to develop simple, scalable, and cost‐effective techniques that allow to obtain smart coatings with high optical performance.…”

Section: Introductionmentioning

confidence: 99%

Three‐Layered Hollow Nanospheres Based Coatings with Ultrahigh‐Performance of Energy‐Saving, Antireflection, and Self‐Cleaning for Smart Windows

Yao

Pang

et al. 2018

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In this study, a well-controlled interfacial engineering method for the synthesis of SiO /TiO /VO three-layered hollow nanospheres (TLHNs) and TLHNs-based multifunctional coatings is reported. The as-prepared coatings allow for an outstanding integration of thermochromism from the outer VO (M) layer, photocatalytic self-cleaning capability from the middle TiO (A) layer, and antireflective property from internal SiO HNs. The TLHNs coatings exhibit excellent optical performance with ultrahigh luminous transmittance (T = 74%) and an improved solar modulation ability (ΔT = 12%). To the best knowledge, this integrated optical performance is the highest ever reported for TiO /VO -based thermochromic coatings. An ingenious computation model is proposed, which allows the n of nanostructured coatings to be rapidly obtained. The experimental and calculated results reveal that the unique three-layered structure significantly reduces the refractive index (from 2.25 to 1.33 at 600 nm) and reflectance (Rave, from 22.3 to 5.3%) in the visible region as compared with dense coatings. Infrared thermal imaging characterization and self-cleaning tests provide valid evidence of SiO /TiO /VO TLHNs coatings' potential for energy-saving and self-cleaning smart windows. The exciting inexpensive and universal fabrication process for well-defined structures may inspire various developments in processable and multifunctional devices.

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Section: Introductionmentioning

confidence: 99%

Three‐Layered Hollow Nanospheres Based Coatings with Ultrahigh‐Performance of Energy‐Saving, Antireflection, and Self‐Cleaning for Smart Windows

Yao

Pang

et al. 2018

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“…VO 2 can be synthesized both in bulk powder form as well as in thin film form. As the latter is more suitable option for a variety of applications pertaining to device design and surfaces, many groups have investigated the growth of VO 2 films using pulsed laser deposition (PLD) [16,17], magnetron sputtering [18][19][20][21][22], molecular beam epitaxy (MBE) [23], e-beam deposition [24][25][26], sol-gel [27][28][29][30][31][32] and CVD [33][34][35][36][37][38] methods. Some of these attempts also focused on the effect of strain via the choice of the substrate on the phase transition characteristics of this system [39][40][41][42][43][44], while there was at least one work attempting to utilize the MBE method that is known for small scale film growth to obtain high quality VO 2 films on large area substrate [45].…”

Section: Introductionmentioning

confidence: 99%

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Uslu¹,

Misirlioglu²,

Şendur³

2018

Opt. Mater. Express

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We demonstrate the growth of highly textured VO 2 nanocrystals via annealing of e-beam deposited amorphous metallic V. Temperature dependent ellipsometry results reveal the pronounced reflection near the IR spectrum above the transition and an almost temperature independent weak reflection in the visible spectrum. The IR reflection displays a strong hysteresis during heating and cooling near the transition temperature at 68°C, indicating a first order transition and a strain-free structure. Our work demonstrates the feasibility to obtain high quality phase change nanostructures that transmit the visible spectrum but reflect IR and is suitable for large scale fabrication.

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“…The MOCVD experiments were conducted in a cold-wall CVD reactor under lowpressure conditions (p < 10 −6 bar), equipped with cooling traps, an internal pressure sensor and external temperature sensors. More detailed information can be found in previous publications from our working group [63][64][65].…”

Section: Methodsmentioning

confidence: 99%

Vapor Phase Synthesis of SnS Facilitated by Ligand-Driven “Launch Vehicle” Effect in Tin Precursors

et al. 2021

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Extraordinary low-temperature vapor-phase synthesis of SnS thin films from single molecular precursors is attractive over conventional high-temperature solid-state methods. Molecular-level processing of functional materials is accompanied by several intrinsic advantages such as precise control over stoichiometry, phase selective synthesis, and uniform substrate coverage. We report here on the synthesis of a new heteroleptic molecular precursor containing (i) a thiolate ligand forming a direct Sn-S bond, and (ii) a chelating O^N^N-donor ligand introducing a “launch vehicle”-effect into the synthesized compound, thus remarkably increasing its volatility. The newly synthesized tin compound [Sn(SBut)(tfb-dmeda)] 1 was characterized by single-crystal X-ray diffraction analysis that verified the desired Sn:S ratio in the molecule, which was demonstrated in the direct conversion of the molecular complex into SnS thin films. The multi-nuclei (1H, 13C, 19F, and 119Sn) and variable-temperature 1D and 2D NMR studies indicate retention of the overall solid-state structure of 1 in the solution and suggest the presence of a dynamic conformational equilibrium. The fragmentation behavior of 1 was analyzed by mass spectrometry and compared with those of homoleptic tin tertiary butyl thiolates [Sn(SBut)2] and [Sn(SBut)4]. The precursor 1 was then used to deposit SnS thin films on different substrates (FTO, Mo-coated soda-lime glass) by CVD and film growth rates at different temperatures (300–450 °C) and times (15–60 min), film thickness, crystalline quality, and surface morphology were investigated.

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Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO₂ and V₂O₃ Nanostructures

Abstract: ABSTRACT

Cited by 31 publications

References 58 publications

Three‐Layered Hollow Nanospheres Based Coatings with Ultrahigh‐Performance of Energy‐Saving, Antireflection, and Self‐Cleaning for Smart Windows

Three‐Layered Hollow Nanospheres Based Coatings with Ultrahigh‐Performance of Energy‐Saving, Antireflection, and Self‐Cleaning for Smart Windows

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Vapor Phase Synthesis of SnS Facilitated by Ligand-Driven “Launch Vehicle” Effect in Tin Precursors

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Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO2 and V2O3 Nanostructures

Abstract: ABSTRACT

Cited by 31 publications

References 58 publications

Three‐Layered Hollow Nanospheres Based Coatings with Ultrahigh‐Performance of Energy‐Saving, Antireflection, and Self‐Cleaning for Smart Windows

Three‐Layered Hollow Nanospheres Based Coatings with Ultrahigh‐Performance of Energy‐Saving, Antireflection, and Self‐Cleaning for Smart Windows

Selective IR response of highly textured phase change VO2 nanostructures obtained via oxidation of electron beam deposited metallic V films

Vapor Phase Synthesis of SnS Facilitated by Ligand-Driven “Launch Vehicle” Effect in Tin Precursors

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Product

Resources

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Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO₂ and V₂O₃ Nanostructures

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films