グラフェンテンプレート垂直亜鉛フタロシアニンナノ柱の相変化
D Leonardo Gonzalez Arellano1, Edmund K Burnett1, Sema Demirci Uzun1
1Department of Polymer Science and Engineering , University of Massachusetts Amherst , Amherst , Massachusetts 01003 , United States.
Journal of the American Chemical Society
|June 8, 2018
まとめ
シングルクリスタルナノピラーにおける分子包装を制御する方法を開発しました これは,ナノ構造を変更せずにガスのセンサーの性能を向上させる
科学分野:
- 材料科学
- ナノテクノロジー
- クリスタルグラフィー
背景:
- シンクフタロシアニン (ZnPc) 単一結晶ナノ柱は,ガス感知アプリケーションに有望である.
- 分子パッキングの制御は デバイスの性能を最適化するために不可欠です
- 既存の方法はしばしばナノ構造の形態を変えます
研究 の 目的:
- ZnPc単結晶ナノ柱のグラフェン補助成長と相変化を調査する.
- 結晶化後のアニリングによる形態学-保持段階の移行を調査する.
- 制御された分子パッキングを通してガスセンサーの性能を向上させる.
主な方法:
- ZnPcナノピラーをグラフェンで合成する.
- 結晶化後の熱冷却は,相転換のために.
- 牧草発生率のX線 difraktionと高解像度のTEMを特徴づけている.
- 化学抵抗ガスのセンサーの製造と試験
主要な成果:
- 垂直方向の単結晶ZnPcナノピラーを達成した.
- メタステーブルからβ相への形質保持性移行が解熱によって示された.
- β相ナノピラーでは,最適化された分子指向により,アンモニアガスの感受性の改善が観察されました.
- ZnPcナノピラーセンサーは,アンモニア蒸気に対する選択性を示した.
結論:
- 有機単一結晶ナノピラーにおける形質保持相移行に関する最初の報告.
- 熱アニリングは,重要な形態学的変化なしに分子包装制御の経路を提供します.
- このアプローチは,高性能な有機電子機器を開発し,構造-特性関係を理解するために不可欠です.
関連する概念動画
Phase Transitions
23.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.3K
Phase Transitions: Sublimation and Deposition
20.2K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
20.2K
Phase Transitions: Melting and Freezing
15.2K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.2K
Phase Transitions: Vaporization and Condensation
21.5K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.5K
Phase Diagrams
50.3K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
50.3K
DNA as a Genetic Template
27.9K
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
27.9K


