Large constriction of lattice constant in epitaxial magnesium oxide thin film: Effect of point defects on lattice constant

Kaneko, Satoru; Nagano, Takahiro; Akiyama, Kensuke; Ito, Takeshi; Yasui, Manabu; Hirabayashi, Yasuo; Funakubo, Hiroshi; Yoshimoto, Mamoru

doi:10.1063/1.3361482

Cited by 28 publications

(26 citation statements)

References 18 publications

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“…As a next step, further thermal energy could promote the diffusion of the oxygen vacancies into the interior of the NiO NP, which possesses many innate nickel vacancies. Last, the oxygen vacancies encounter the nickel vacancies due to the electrostatic attraction and generate Schottky defects, which nullify the nickel vacancies and cause the lattice constriction [24] (Figure 5).…”

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confidence: 99%

Sensitive Wearable Temperature Sensor with Seamless Monolithic Integration

et al. 2019

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Accurate temperature field measurement provides critical information in many scientific problems. Herein, a new paradigm for highly sensitive, flexible, negative temperature coefficient (NTC) thermistor‐based artificial skin is reported, with the highest temperature sensing ability reported to date among previously reported NTC thermistors. This artificial skin is achieved through the development of a novel monolithic laser‐induced reductive sintering scheme and unique monolithic structures. The unique seamless monolithic structure simultaneously integrates two different components (a metal electrode and metal oxide sensing channel) from the same material at ambient pressure, which cannot be achieved by conventional heterogeneous integration through multiple, complex steps of photolithography or vacuum deposition. In addition to superior performance, electronic skin with high temperature sensitivity can be fabricated on heat‐sensitive polymer substrates due to the low‐temperature requirements of the process. As a proof of concept, temperature‐sensitive artificial skin is tested with conformally attachable physiological temperature sensor arrays in the measurement of the temperatures of exhaled breath for the early detection of pathogenic progression in the respiratory system. The proposed highly sensitive flexible temperature sensor and monolithic selective laser reductive sintering are expected to greatly contribute to the development of essential components in various emerging research fields, including soft robotics and healthcare systems.

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confidence: 99%

Sensitive Wearable Temperature Sensor with Seamless Monolithic Integration

et al. 2019

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“…The contraction of lattice constants is predicted with the Schottky defects consisting a pair of Mg and O atoms. 19 Interestingly, AFM image revealed nano-cube MgO particles grown on Si(001) substrates. Figure 3 shows AFM images of MgO prepared in oxygen pressure of (a) 75 and (b) 200 mTorr at substrate temperature of 750 C. Nano-cube particles were grown on the samples prepared in oxygen pressure of 200 mTorr.…”

Section: Resultsmentioning

confidence: 98%

“…The details of the pseudopowder XRD mapping can be found elsewhere. 19 The surface morphology was observed by Atomic Force Microscopy (AFM). X-ray Photoelectron Spectroscopy (XPS) was employed to analyze an MgO deposited on the surface of Si(001) substrate.…”

Section: Methodsmentioning

confidence: 99%

“…An epitaxial film grows on Si(001) substrate with its contraction of lattice constants. 19 In this study, expecting high quality MgO film, the MgO film prepared in the oxygen pressure ranging from 75∼400 mTorr at the high temperature of ∼750 C. The deposited MgO showed the growth of (001) preferred orientation on the Si(001) substrate. However, X-ray Photoelectron Spectroscopy (XPS) indicated the MgO film did not form a continuous film on the Si surface.…”

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confidence: 99%

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Nano-Cube MgO Formed on Silicon Substrate Using Pulsed Laser Deposition

Kaneko¹,

Ito²,

Akiyama³

et al. 2012

j nanosci nanotechnol

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Nano-cube MgO particles were formed on Si substrates by deposition of an MgO target using pulsed laser deposition method. An epitaxial film grows on Si(001) substrate with its contraction of lattice constants. In this study, expecting high quality MgO film, the MgO film prepared in the oxygen pressure ranging from 75-400 mTorr at the high temperature of -750 degrees C. The deposited MgO showed the growth of (001) preferred orientation on the Si(001) substrate. However, X-ray Photoelectron Spectroscopy (XPS) indicated the MgO film did not form a continuous film on the Si surface. Interestingly, the surface morphology observed by an Atomic Force Microscopy (AFM) showed nano-cube MgO particles scattered on the smooth surface of Si substrate. After annealing the nano-cube MgO, the shape of MgO particles were changed from nano-cube to round shaped particles. The AFM image of the surface showed round shaped MgO nanoparticles scattered on rough surface. X-ray Diffraction (XRD) revealed the epitaxial growth of MgO(001) with cubic on cubic arrangement on the Si(001) substrate (MgO[100] parallel to Si[100]).

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“…Due to the electrostatic attraction effect, the Schottky defects could appear when the oxygen vacancies encounter the nickel vacancies, causing lattice contraction. 54 Besides, Mo/W ions could also occupy some vacancies and bond with Ni atoms, which decreases the vacancies in the crystalline state. The DTF calculation proves this process.…”

Section: Relative Resistancementioning

confidence: 99%