Creation of 3D terahertz photonic crystals by the direct writing technique with a TiO<sub>2</sub> sol‐gel ink

Wang, Rong; Yang, Weiyi; Zhu, Pengfei; Gao, Shuang; Li, Bo; Li, Qi

doi:10.1111/jace.15347

Cited by 18 publications

(11 citation statements)

References 28 publications

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“…Based on the hydrolysis of titanium diisopropoxide bis(acetylacetonate) (TIA), the TiO 2 sol‐gel ink was synthesized according to previous reports . In brief, 0.62 g of polyvinylpyrrolidone (PVP) (Mw = 55 000; Sigma‐Aldrich Corporation, St. Louis, MO) and 12.56 mL of TIA (75 wt% in 2‐propanol; Sigma‐Aldrich Corporation) were dissolved in 8 mL of absolute ethanol (EtOH; Sinopharm Chemical Reagent Co., Ld., Shanghai, China).…”

Section: Methodsmentioning

confidence: 99%

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

et al. 2019

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Ceramic photonic crystals have wide application potentials for THz technology due to their characteristic strong chemical stability and high temperature resistance for demanding environment. However, it is still a challenge to modulate the THz properties of as-prepared ceramic TPCs via post-creation treatments to satisfy different application requirements. In this work, the THz properties of rutile TiO 2 ceramic 3D-TPCs were modulated by non-metal anion doping of either carbon or nitrogen, which was firstly created by the direct-writing technique with a TiO 2 sol-gel ink followed by the high temperature sintering process at 1200°C. Calcination of the pristine rutile TiO 2 ceramic 3D-TPCs in either CO or NH 3 atmosphere successfully doped either C or N dopants into rutile TiO 2 ceramic 3D-TPCs, respectively, which changed their dielectric properties and subsequently induced different THz properties on these ceramic 3D-TPCs with the same structure. Their THz properties were found to be largely affected by the specific nature of the dopant. Compared with the pristine rutile TiO 2 ceramic 3D-TPC, the bandgap positions of both C-doped and Ndoped rutile TiO 2 ceramic 3D-TPCs largely shifted toward the higher frequency, while the N-doped sample demonstrated a much broader bandgap. Thus, non-metal anion doping could be an effective post-creation approach to modulate the THz properties of ceramic TPCs. K E Y W O R D S 3D-terahertz photonic crystals, anion doping, direct-writing, rutile TiO 2 , sol-gel ink How to cite this article: Wang R, Yang W, Gao S, et al. Modulation of terahertz properties of 3D ceramic photonic crystals via post-creation non-metal anion doping treatment. J Am Ceram Soc. 2019;102:4688-4697. https://doi.

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Section: Methodsmentioning

confidence: 99%

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

et al. 2019

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“…In either case, DIW resolution is typically comparable to the nozzle diameter, restricting feature sizes of this technique to around one micron [160]. Nevertheless, DIW has excellent material compatibility and has been demonstrated with a wide array of materials including metals [150,[161][162][163][164], ceramics [165][166][167], polymers [160,168,169], and even biological media [170,171].…”

Section: Inkjet Printingmentioning

confidence: 99%

“…Gratson et al used a polymer ink composed of polyethylenimine and polyacrilic acid and 1 μm diameter glass nozzle to form a woodpile structure via DIW [160]. Wang et al used a TiO 2 sol-gel ink and 60 μm nozzle in order to create woodpile PCs operating in the terahertz frequency range [165]. Zhu et al fabricated woodpile PCs for application at terahertz frequencies, but used a barium titanate (BaTiO 3 ) ink embedded in PDMS, with nozzle diameter of 180 μm [166].…”

Section: Photonic Crystalsmentioning

confidence: 99%

3D Nanophotonic device fabrication using discrete components

Melzer

McLeod

2020

Nanophotonics

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AbstractThree-dimensional structure fabrication using discrete building blocks provides a versatile pathway for the creation of complex nanophotonic devices. The processing of individual components can generally support high-resolution, multiple-material, and variegated structures that are not achievable in a single step using top-down or hybrid methods. In addition, these methods are additive in nature, using minimal reagent quantities and producing little to no material waste. In this article, we review the most promising technologies that build structures using the placement of discrete components, focusing on laser-induced transfer, light-directed assembly, and inkjet printing. We discuss the underlying principles and most recent advances for each technique, as well as existing and future applications. These methods serve as adaptable platforms for the next generation of functional three-dimensional nanophotonic structures.

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“…Titanium dioxide (TiO 2 ), as a multifunctional semiconducting metal oxide material, holds great potential in many applications, especially for energy and environmental applications, due to its excellent optical and electrical properties, high photocatalytic activity, biocompatibility, environmental stability, and low cost . In recent years, 3D printing of TiO 2 structures has been demonstrated using sol‐gel‐based inks . However, the requirement for expensive metal alkoxide precursors and the tedious preparation process limit the throughput of 3D‐printable sol–gel ink, which hinders practical applications.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Powder‐Based Inks into Functional Hierarchical Porous TiO₂ Materials

Liu

Guo

et al. 2019

Adv Eng Mater

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Integrating multifunctional semiconducting metal oxide powders into a 3D printing technique to construct hierarchical porous structures is highly desirable and remains a significant challenge. Herein, an extrusion‐based 3D printing strategy is developed that can assemble TiO2 powders into hierarchical porous structures with multiscale pores at both the macro‐ and microscale. Powder‐based TiO2 inks with a significant shear‐thinning behavior and adequate storage modulus and yield stress are developed to meet the requirements of 3D printing of TiO2 in an air environment without the need for an additional solidification treatment, which provides good printing flexibility. The hierarchical porous structures with a relatively high compressive strength provide the 3D‐printed TiO2 structures with great potential for use in many applications, including filtration, thermal insulation, biomedical scaffolds, catalyst supports, and energy conversion. Compared with scaffolds with a compact morphology, the hierarchical porous TiO2 scaffold as a photoelectrode achieves a higher nitrogen photofixation yield due to its high surface adsorption and activation capacity caused by its porous morphology. Importantly, the powder‐based ink design and extrusion‐based 3D printing approach are readily extended to other semiconducting metal oxides such as ZnO and their composites.

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Creation of 3D terahertz photonic crystals by the direct writing technique with a TiO₂ sol‐gel ink

Cited by 18 publications

References 28 publications

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

3D Nanophotonic device fabrication using discrete components

3D Printing of Powder‐Based Inks into Functional Hierarchical Porous TiO₂ Materials

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Creation of 3D terahertz photonic crystals by the direct writing technique with a TiO2 sol‐gel ink

Cited by 18 publications

References 28 publications

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

Modulation of terahertz properties of 3D ceramic photonic crystals via post‐creation non‐metal anion doping treatment

3D Nanophotonic device fabrication using discrete components

3D Printing of Powder‐Based Inks into Functional Hierarchical Porous TiO2 Materials

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Product

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Creation of 3D terahertz photonic crystals by the direct writing technique with a TiO₂ sol‐gel ink

3D Printing of Powder‐Based Inks into Functional Hierarchical Porous TiO₂ Materials