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Modulation of Cu2–xS Nanocrystal Plasmon Resonance through Reversible Photoinduced Electron Transfer
ACS Nano ( IF 15.8 ) Pub Date : 2016-02-11 00:00:00 , DOI: 10.1021/acsnano.5b08066 Rabeka Alam 1 , Molly Labine 1 , Christopher J. Karwacki 2 , Prashant V. Kamat 1
ACS Nano ( IF 15.8 ) Pub Date : 2016-02-11 00:00:00 , DOI: 10.1021/acsnano.5b08066 Rabeka Alam 1 , Molly Labine 1 , Christopher J. Karwacki 2 , Prashant V. Kamat 1
Affiliation
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Copper sulfide (Cu2–xS) nanocrystals with nonstoichiometric composition exhibit plasmon resonance in the near-infrared region. Compositional changes and varying electron density markedly affect the position and intensity of the plasmon resonance. We report a photochemically induced phenomenon of modulating the plasmon resonance in a controlled fashion. As photogenerated reduced methyl viologen radicals transfer electrons to Cu2–xS in inert solutions, we observe a decrease in localized surface plasmon resonance (LSPR) absorbance at 1160 nm. Upon exposure to air, the plasmon resonance band recovers as stored electrons are scavenged away by oxygen. This cycle of electron charge and discharge of Cu2–xS nanocrystals is reversible and can be repeated through photoirradiation in N2 saturated solution followed by exposure of the suspension to air. The spectroscopic studies that provide mechanistic insights into the reversible charging and discharging of plasmonic Cu2–xS are discussed.
中文翻译：
可逆光诱导电子转移对Cu 2– x S纳米晶等离子体共振的调制
具有非化学计量组成的硫化铜（Cu 2- x S）纳米晶体在近红外区域表现出等离子体共振。成分变化和变化的电子密度显着影响等离子体激元共振的位置和强度。我们报告了以受控方式调节等离子体共振的光化学诱导现象。当光生还原的甲基紫罗兰自由基在惰性溶液中将电子转移到Cu 2– x S时，我们观察到在1160 nm处局部表面等离子体激元共振（LSPR）吸光度降低。暴露于空气后，随着氧气清除存储的电子，等离振子共振带将恢复。电子对Cu 2– x的充放电循环S纳米晶体是可逆的，可以通过在N 2饱和溶液中进行光辐照，然后将悬浮液暴露于空气中而重复进行。讨论了能为等离子Cu 2– x S的可逆充电和放电提供机械性见解的光谱研究。
更新日期：2016-02-11
中文翻译：
可逆光诱导电子转移对Cu 2– x S纳米晶等离子体共振的调制
具有非化学计量组成的硫化铜（Cu 2- x S）纳米晶体在近红外区域表现出等离子体共振。成分变化和变化的电子密度显着影响等离子体激元共振的位置和强度。我们报告了以受控方式调节等离子体共振的光化学诱导现象。当光生还原的甲基紫罗兰自由基在惰性溶液中将电子转移到Cu 2– x S时，我们观察到在1160 nm处局部表面等离子体激元共振（LSPR）吸光度降低。暴露于空气后，随着氧气清除存储的电子，等离振子共振带将恢复。电子对Cu 2– x的充放电循环S纳米晶体是可逆的，可以通过在N 2饱和溶液中进行光辐照，然后将悬浮液暴露于空气中而重复进行。讨论了能为等离子Cu 2– x S的可逆充电和放电提供机械性见解的光谱研究。
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