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Bumpy Hollow Gold Nanospheres for Theranostic Application: Effect of Surface Morphology on Photothermal Conversion Efficiency
摘要： The combination of hollow core and rugose surface morphology is highly attractive for photoactive near-infrared (NIR) nanomaterials. Here, we present a facile pH modification to hollow gold nanosphere (HGN) synthesis to enable controlled tuning of the surface morphology from smooth to very bumpy. Unlike other methods, the synthetic protocol does not require harsh surfactants, secondary reducing agents, or organic solvents. The resultant bumpy HGNs (bHGNs) are highly monodisperse with little variation in protrusion length from particle to particle. Mechanistic studies suggest that surface rugosity is mainly controlled by the presence of free OH- ions in solution. We also present the first systematic investigation into the effect of surface morphology on the photothermal conversion efficiency (PCE) of bumpy as well as smooth HGNs, with a maximum PCE reaching 99%. Although expected to have a higher scattering component, the bHGNs retain the excellent PCE of their smooth counterparts, which may be due to efficient reabsorption of scattered light.
关键词： surface plasmon resonance,photothermal conversion efficiency,heat generation,surface morphology,hollow gold nanospheres
更新于2025-09-23 15:23:52
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Fabrication and characterisation of viscose fibre with photoinduced heat-generating properties
摘要： In the field of functional textile research, heat-generating fibres to maintain body temperature without unsustainable energy input are of interest. Here, we propose a photoinduced heat-generating viscose fibre fabricated by adding zirconium carbide (ZrC) to the viscose solution. Viscose nonwoven fabrics comprising ZrC-doped viscose fibres were irradiated by infrared (IR) light to measure their surface temperatures, thereby determining their light-to-heat conversion effects. The results show that the surface temperature of the viscose fabric doped with 4% ZrC was increased by almost 40 °C, as verified by ultraviolet–visible–near-IR (NIR) spectroscopy, indicating that the ZrC-doped viscose fibre was significantly increased in photon absorption in the visible-light and NIR regions. The cross-sectional morphology of the viscose fibre was observed using a scanning electron microscope. In addition, thermogravimetric analysis was used to determine the thermal decomposition behaviour of the doped viscose fibres. Moreover, it is noticed that the ZrC-doped viscose fibre has lower moisture regain, potentially increasing the wet strength of the viscose fibre.
关键词： Zirconium carbide,Photoinduced heat-generation,Viscose fibre,Light absorption
更新于2025-09-23 15:23:52
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An optimized phosphor model coupled with thermal and optical behavior and a thereof ring-shaped phosphor convertor for improving thermal uniformity in laser illuminations
摘要： Due to the high energy density of laser diode (LD), the ?uorescent convertor always su?ers from serious overheating problems, such as thermal quenching, signi?cant e?ciency drop or even material carbonization failure. In this work, we improved the current optical-thermal model by coupling the optical behavior of red (nitride)/yellow (YAG) phosphor and thermal conductivity of di?erent hybrid particles concentrations. According to the theoretical analysis, the thermal sensitive concentration zone was revealed. To avoid the hotspot occurs, a ring-shaped phosphor convertor with two di?erent concentrations was developed. Results showed that the convertor with high-concentration center could reduce the max temperature by 9.4% without obvious optical power loss. Some further research suggestions were also proposed to improve the thermal performances of the laser illumination.
关键词： Thermal management,Phosphor heat generation,Theoretical model,Laser illumination
更新于2025-09-23 15:21:01
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Photon-Assisted Heat Generation by Electric Current in a Quantum Dot Attached to Ferromagnetic Leads
摘要： Heat generated by electric current in a quantum dot device contacting a phonon bath is studied using the non-equilibrium Green function technique. Spin-polarized current is generated owing to the Zeeman splitting of the dot level. The current’s strength and the spin polarization are further manipulated by changing the frequency of an applied photon field and the ferromagnetism on the leads. We find that the associated heat by this spin-polarized current emerges even if the bias voltage is smaller than the phonon energy quanta and obvious negative differential of the heat generation develops when the photon frequency exceeds that of the phonon. It is also found that both the strength and the resonant peaks’ position of the heat generation can be tuned by changing the value and the arrangement configurations of the magnetic moments of the two leads, and then provides an effective method to generate large spin-polarized current with weak heat. Such a result may be useful in designing low energy consumption spintronic devices.
关键词： quantum dot,heat generation,ferromagnetic leads,photon-assisted tunneling,spin-polarized current
更新于2025-09-23 15:19:57