Flash Ignition of Freestanding Porous Silicon Films: Effects of Film Thickness and Porosity

Ohkura, Yuma; Weisse, Jeffrey M.; Cai, Lili; Zheng, Xiaolin

doi:10.1021/nl403114g

Cited by 41 publications

(19 citation statements)

References 45 publications

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“…This rapid assembly can be achieved by extremely high temperature (peak temperature, T peak ≈ 600 °C) annealing within a millisecond duration enabled by the intensive photothermal effect from flash light. Finite element method (FEM) analysis of the photothermal effect [average energy density = 78.8 J cm −2 and light pulse duration (FWHM): 15 ms] at the silicon substrate are shown in Figure b,c . Owing to the 2D large area processability of our xenon flash lamp system, the temperature of large surface area of silicon substrate (10 mm × 10 mm) uniformly reaches over 600 °C (Figures S1–S3, Supporting Information).…”

Section: Properties Of the Bcps Of Low‐χ Sm (Ps‐b‐pmma) S2v (Ps‐b‐p2mentioning

confidence: 99%

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

et al. 2017

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One of the fundamental challenges encountered in successful incorporation of directed self-assembly in sub-10 nm scale practical nanolithography is the process compatibility of block copolymers with a high Flory-Huggins interaction parameter (χ). Herein, reliable, fab-compatible, and ultrafast directed self-assembly of high-χ block copolymers is achieved with intense flash light. The instantaneous heating/quenching process over an extremely high temperature (over 600 °C) by flash light irradiation enables large grain growth of sub-10 nm scale self-assembled nanopatterns without thermal degradation or dewetting in a millisecond time scale. A rapid self-assembly mechanism for a highly ordered morphology is identified based on the kinetics and thermodynamics of the block copolymers with strong segregation. Furthermore, this novel self-assembly mechanism is combined with graphoepitaxy to demonstrate the feasibility of ultrafast directed self-assembly of sub-10 nm nanopatterns over a large area. A chemically modified graphene film is used as a flexible and conformal light-absorbing layer. Subsequently, transparent and mechanically flexible nanolithography with a millisecond photothermal process is achieved leading the way for roll-to-roll processability.

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Section: Properties Of the Bcps Of Low‐χ Sm (Ps‐b‐pmma) S2v (Ps‐b‐p2mentioning

confidence: 99%

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

et al. 2017

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“…21 This system was used to test the original MSST, 12 and is important for various applications, including energetic materials. 22 We use a 512-atom system in an initial cubic supercell with a side length of 21.75 Å , which gives a zero-pressure diamond structure with its [100], [010], and [001] directions along the supercell sides. The equations of motion are solved using an explicit reversible integrator 23 with a time step of 1.2 fs.…”

mentioning

confidence: 99%

Crystalline anisotropy of shock-induced phenomena: Omni-directional multiscale shock technique

Shimamura

Misawa

Ohmura

et al. 2016

Applied Physics Letters

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We propose an omni-directional multiscale shock technique (OD-MSST) to study the shock waves in an arbitrary direction of crystalline materials, atomistically based on the molecular dynamics simulation method. Using OD-MSST, we found transitions from elastic to shear-banding to plastic behaviors for a model covalent crystal. In addition to such a shock “phase diagram,” a transition from inter-molecular to intra-molecular mechanochemical reaction pathways was found as a function of crystallographic orientation in an energetic van der Waals crystal.

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“…Silicon can also be fabricated as an energetic material by creating high surface area powders or porous films [85][86][87]. Porous silicon is created by electrochemical etching and is a highly tunable system for ignition properties and integration into semiconductor based devices [88,89].…”

Section: Semiconductorsmentioning

confidence: 99%

Towards Safer Primers: A Review

Lundgaard

Cahill

et al. 2019

Technologies

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Primers are used to reliably initiate a secondary explosive in a wide range of industrial and defence applications. However, established primer technologies pose both direct and indirect risks to health and safety. This review analyses a new generation of primer materials and ignition control mechanisms that have been developed to address these risks in firearms. Electrically or optically initiated metal, oxide and semiconductor-based devices show promise as alternatives for heavy metal percussive primers. The prospects for wider use of low-cost, safe, reliable and non-toxic primers are discussed in view of these developments.

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Flash Ignition of Freestanding Porous Silicon Films: Effects of Film Thickness and Porosity

Cited by 41 publications

References 45 publications

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

Crystalline anisotropy of shock-induced phenomena: Omni-directional multiscale shock technique

Towards Safer Primers: A Review

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