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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

710
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
710
Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

5.0K
Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
5.0K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.5K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.5K
Sensitivity, Specificity, and Predicted Value01:13

Sensitivity, Specificity, and Predicted Value

1.3K
In healthcare diagnostics, laboratory tests play a crucial role in identifying and diagnosing a wide range of medical conditions. However, interpreting test results is not always straightforward. An abnormal test result does not always confirm the presence of a disease, just as a normal result does not guarantee its absence. To assess the reliability of these diagnostic tools, healthcare practitioners rely on two key statistical indicators: sensitivity and specificity.
Sensitivity is the...
1.3K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

649
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
649
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

795
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
795

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Updated: Jan 29, 2026

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
11:10

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

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二次元酸化バナジウムを用いた高感度テラヘルツ検出

Shengnan Yan1, Qiangqiang Wu2, Xiunan Yan1

  • 1Institute of Brain-inspired Institute National Laboratory of Solid-State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing 210093, China.

ACS nano
|January 27, 2026
PubMed
まとめ

単結晶二次元酸化バナジウム（VO2(B)）は、ヒステリシスフリーで線形な熱抵抗応答を示し、従来の材料の限界を克服する。このブレークスルーにより、高度な熱センサーによる高感度テラヘルツ（THz）検出が可能になる。

キーワード:
二次元酸化バナジウムテラヘルツボロメータ室温テラヘルツ検出抵抗温度係数熱抵抗効果

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関連する実験動画

Last Updated: Jan 29, 2026

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

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科学分野:

  • 材料科学
  • 物性物理学
  • ナノテクノロジー

背景:

  • 熱抵抗効果は熱センサーの鍵であるが、金属-絶縁体転移（MIT）によるヒステリシスや非線形性によってしばしば制限される。
  • 酸化バナジウム（VO2）はMITを示す一般的な材料であり、センサーの性能に問題を引き起こす。
  • 二次元（2D）材料は、量子閉じ込めと高い表面積により独自の特性を提供する。

研究 の 目的:

  • 単結晶二次元酸化バナジウム（ブロンズ相、VO2(B)）の熱抵抗特性を調査する。
  • 二次元VO2(B)のテラヘルツ（THz）高感度検出への応用可能性を評価する。
  • 二次元VO2(B)におけるMIT抑制のメカニズムを理解する。

主な方法:

  • 単結晶二次元VO2(B)材料の合成。
  • 電気輸送測定用デバイスの作製。
  • 線形性やヒステリシスを含む熱抵抗応答の特性評価。
  • 二次元VO2(B)に基づくテラヘルツマイクロボロメータの性能評価。

主要な成果:

  • 二次元VO2(B)は、ヒステリシスフリーで非常に線形な熱抵抗応答を示す。
  • 二次元VO2(B)では、バナジウム-バナジウム二量化の抑制により、金属-絶縁体転移（MIT）が抑制されると考えられる。
  • 電気伝導率4.24 × 10^-3 Ω·cm、抵抗温度係数（TCR）約4.0%/Kを達成した。
  • テラヘルツマイクロボロメータは、室温で722 pW/√Hzの雑音等価電力と約109 μsの応答時間を示した。

結論:

  • 二次元VO2(B)は、高性能熱検出、特にテラヘルツ応用にとって有望な材料である。
  • 二次元VO2(B)におけるMITの抑制は、従来の熱抵抗材料の主要な限界を克服する。
  • 本研究は、感度と線形性が向上した高度なセンサーの開発への道を開く。