Temperature-Dependent Luminescence of Nd3+-Doped Carbon Nanodots for Nanothermometry

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Cecilia Wetzl, Carlos Renero-Lecuna, Lucia Cardo*, Luis M. Liz-Marzán and Maurizio Prato*, 
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Abstract

Noncontact optical nanothermometers operating within the biological transparency windows are required to study temperature-sensitive biological phenomena at the nanoscale. Nanoparticles containing rare-earth ions such as Nd3+ have been reported to be efficient luminescence-based ratiometric thermometers, however often limited by poor water solubility and concentration-related quenching effects. Herein, we introduce a new type of nanothermometer, obtained by employing low-dimensional carbon nanodots (CNDs) as matrices to host Nd3+ ions (NdCNDs). By means of a one-pot procedure, small (∼7–12 nm), water-soluble nanoparticles were obtained, with high (15 wt %) Nd3+ loading. This stable metal-CND system features temperature-dependent photoluminescence in the second biological window (BW II) upon irradiation at 808 nm, thereby allowing accurate and reversible (heating/cooling) temperature measurements with good sensitivity and thermal resolution. The system possesses remarkable biocompatibility in vitro and promising performance at a high penetration depth in tissue models.

Abstract Image

Abstract Image

用于纳米温度测量的掺钕碳纳米点的温度依赖性发光。
要在纳米尺度上研究对温度敏感的生物现象,就需要在生物透明窗口内工作的非接触式光学纳米温度计。据报道,含有稀土离子(如 Nd3+)的纳米粒子是高效的基于发光的比率温度计,但往往受到水溶性差和浓度相关淬灭效应的限制。在此,我们介绍一种新型纳米温度计,它采用低维碳纳米点(CNDs)作为基质来承载 Nd3+ 离子(NdCNDs)。通过一锅程序,获得了具有高(15 wt %)Nd3+负载的水溶性小纳米颗粒(7∼12 nm)。这种稳定的金属-CND 系统在 808 纳米波长的照射下,在第二个生物窗口(BW II)发出随温度变化的光致发光,从而可以进行精确、可逆(加热/冷却)的温度测量,并具有良好的灵敏度和热分辨率。该系统在体外具有出色的生物相容性,在组织模型中的高穿透深度性能良好。
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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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