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Ultrathin Tellurium Oxide/Ammonium Tungsten Bronze Nanoribbon for Multi-Modality Imaging and Second Near-Infrared Region Photothermal Therapy
摘要： Developing nano-photothermal agents (PTAs) with satisfied photothermal conversion efficiency (PTCE) in the second NIR window (1000-1350 nm, NIR II) holds great promise for enhanced photothermal therapy (PTT) effect. Herein, we develop a NIR-II PTA with advanced PTCE, based on a new two-dimensional (2D) ultrathin tellurium oxide/ammonium tungsten bronze (TeO2/(NH4)xWO3) nanoribbons (TONW NRs). The doped ammonia ions mediated-free electrons injection into the LUMO band of WO3 combined with the electronic transitions between W6+ ions and the lone pair of electrons in Te atoms achieve excellent NIR absorption of TONW NRs resulted from localized surface plasmon resonance (LSPR). The polyethylene glycol functionalized TONW NRs (PEG-TONW NRs) exhibit good stability and biocompatibility, displaying a PTCE high to 43.6%, surpassing many previous nano-PTAs active in the NIR II region, leading to remarkable tumor ablation ability both in vitro and in vivo. Meanwhile, advanced X-ray computed tomography (CT) and photoacoustic (PA) imaging capability of PEG-TONW NRs were also realized. Given the admirable photothermal effect in NIR II region, good biocompatibility and advanced CT/PA imaging diagnosis capability, the novel PEG-TONW NRs is promising in future personalized medicine application.
关键词： photothermal therapy,multimodal imaging,tellurium oxide,two-dimensional nanomaterials,ammonium tungsten bronze,the second NIR window
更新于2025-09-23 15:22:29
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Enhanced Nonlinearity and Engineered Anomalous Dispersion in ${\rm{TeO_{2}}}$-coated ${\rm{Si_{3}N_{4}}}$ Waveguides
摘要： We propose designs of silicon nitride (Si3N4) waveguides with enhanced nonlinear parameter and engineered anomalous group velocity dispersion (GVD) by addition of tellurium oxide (TeO2) top-coating layers of various thicknesses. The proposed waveguides have calculated nonlinear parameters of up to three times that of stoichiometric Si3N4 and exhibit anomalous GVD at near infrared wavelengths. The GVD of such waveguides can be tuned between the normal and anomalous regime with different zero dispersion wavelengths by adjusting the thickness of TeO2 coating. These designs offer promise of higher performance nonlinear devices on a standard low-loss Si3N4 platform with the possibility of integration of active functionalities owing to higher solubility of rare earth dopants in tellurium oxide.
关键词： silicon nitride,dispersion engineering,nonlinear optics,Integrated optics,tellurium oxide
更新于2025-09-16 10:30:52