Chemically exfoliated MoS2 as near-infrared photothermal agents.
Chemically exfoliated MoS2 as near-infrared photothermal agents.
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DOI：
10.1002/anie.201209229
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发表时间：
2013-04-08
影响因子：
16.6
通讯作者：
Dravid, Vinayak P.
中科院分区：
文献类型：
--
作者：
Chou, Stanley S.;Kaehr, Bryan;Kim, Jaemyung;Foley, Brian M.;De, Mrinmoy;Hopkins, Patrick E.;Huang, Jiaxing;Brinker, C. Jeffrey;Dravid, Vinayak P.
关键词：
近红外（NIR）窗口是指生物组织高度透明的波长范围（700-1300 nm）。[1]因此，生物成像和治疗模式采用这些波长的光来监测[1]和触发[2]体外和体内的生物事件。例如，光热烧蚀利用NIR吸收材料将光转换成热。[2]所产生的热能可用于许多应用，例如组织消融和药物释放。尽管近红外光热剂的强烈兴趣，他们的发展遭受了相当大的挑战。特别是，很少有纳米材料显示出NIR光热转换所需的必要吸收曲线。NIR光热剂的最初开发主要集中在各向异性金颗粒[3]，如纳米棒[2]，纳米笼[4]和纳米星。[5]这些形状作为近红外吸收的局部等离子体天线，但它们受到复杂合成的阻碍。更重要的是，由于非平衡形态，各向异性的金纳米结构在加热时不可避免地倾向于演变成球形。[5]因此，研究人员已经开始研究石墨烯衍生物如氧化石墨烯（GO）[6]和还原氧化石墨烯（rGO）的近红外光热特性。[7]这些二维（2D）材料的特殊表面积与质量比使它们成为有前途的光热候选者，可以装载高浓度的货物。以前，石墨烯[8] rGO [9]和MoS 2 [10]以及其他[11]已经被探索用作光电探测器。然而，机械剥离的MoS 2光电晶体管的NIR光电流响应可以忽略不计。[10]此外，GO作为近红外光热传感器的功效一直存在争议，[7a]促进了投资。
The near-infrared (NIR) window refers to a range of wavelengths (700–1300 nm) in which biological tissues are highly transparent.[1] Consequently, biological imaging and therapy modalities employ light at these wavelengths for the monitoring [1] and triggering [2] of biological events invitro and in vivo. For instance, photothermal ablation takes advantage of NIR absorbing materials for transducing light into heat.[2] The resultant thermal energy can be used for a number of applications, such as tissue ablation and drug release. Despite the intense interest in NIR photothermal agents, their development has suffered from considerable challenges. In particular, few nanomaterials display the requisite absorption profiles required for NIR photothermal transduction. The initial development of NIR photothermal agents largely focused on anisotropic gold particles [3] such as nanorods,[2] nanocages,[4] and nanostars.[5] These shapes serve as local plasmon antennas for NIR absorbance, but they are encumbered by complicated syntheses. More importantly, because of the non-equilibrium morphologies, anisotropic gold nanostructures inevitably tend to evolve into spheres upon heating.[5]Consequently, researchers have begun to investigate the NIR photothermal properties of graphene derivatives such as graphene oxide (GO)[6] and reduced graphene oxide (rGO).[7] The exceptional surface-area-to-mass ratio of these twodimensional (2D) materials makes them promising photothermal candidates that can be loaded with high cargo concentrations. Previously graphene,[8] rGO,[9] and MoS2[10] among others [11] have been explored for their use as photodectectors. However, a NIR photocurrent response for mechanically exfoliated MoS2 phototransistors was negligible.[10] Additionally, the efficacy of GO as a NIR photothermal transducer has been debated,[7a] prompting inves-
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