グラフェン液体細胞電子顕微鏡における動的化学環境の探査手段としての金ナノ結晶エッチング
Matthew R Hauwiller, Justin C Ondry, Cindy M Chan
1Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|February 20, 2019
まとめ
グラフェン液体細胞電子顕微鏡における電子ビーム放射解析は複雑な化学的性質を生み出します. この研究では,ナノクリスタルエッチングを使用して,ビーム用量が酸化物種濃度を制御し,FeCl3がそれらの比率に影響を与え,ナノスケールでの観測を制御することを示しました.
科学分野:
- 材料科学
- 分析化学
- ナノテクノロジー
背景:
- 液晶電子顕微鏡 (LCEM) は,溶液中のナノスケールダイナミクスを観察するための高解像度を提供します.
- LCEMの電子ビームは放射分解産物を生成し,溶液化学の理解を複雑にする.
- LCEM 中の溶液化学の現地観察は,ナノスケールの実験を信頼するために不可欠です.
研究 の 目的:
- 電子ビーム用量率と鉄塩化物 (FeCl3) 濃度の液体細胞化学への影響を調査する.
- 放射分解効果を理解するための探査機としてナノクリスタルエッチングを使用する.
- 再現可能なLCEM実験のための液体細胞内の化学環境の制御を確立する.
主な方法:
- ナノクリスタルエッチングの軌道を グラフェン液体細胞の探査機として利用した.
- 電子ビームの投与速度の変化とFeCl3のプレロード濃度
- 液体細胞エッチングの結果は,金ナノ結晶のエクシトゥ酸化エッチング実験と相関しています.
主要な成果:
- 低電子ビーム用量は水素バブルを生成し,犠牲の縮小剤として作用した.
- 電子ビームの用量率と,より高い用量で恒常なエッチング率の間の線形関係が観察された.
- FeCl3濃度が酸化物種の比率を制御し,反応の化学的潜在力を影響することが判明した.
結論:
- 電子ビームの量速度は,液体細胞内の酸化物質の総濃度を左右する可能性があります.
- FeCl3濃度は,これらの酸化性種の相対的比率を独立に制御する.
- LCEMを用いたナノスケールの材料科学実験の再現性と範囲を高めます.
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