Enhanced Photothermal Activity of Nanoconjugated System via Covalent Organic Frameworks as the Springboard

Abstract

The development of nanomaterials with high photothermal conversion efficiency has been a hot issue. In this work, a novel photothermal nanomaterial is synthesized using Prussian blue nanocubes (PBNCs) as the photothermal active substance and covalent organic framework (COF) as the substrate. The as‐prepared COF@PBNCs show a high photothermal conversion efficiency of 59.1%, significantly higher than that of pure PBNCs (32.5%). A new circuit path is generated with the combination of COF, which prevents the direct combination of thermal electrons and holes, as well as enhances the nonradiation transition of PBNCs. Besides, the imine groups on COF as the coordination and reduction agent allow the in situ growth of PBNCs, and the dense micropores of COF as the ideal heat conduction channels can also be the potential factors for the enhanced photothermal property. The photothermal property of COF@PBNCs is further used in the construction of immunosensor for the detection of furosemide (FUR). With the help of handheld thermal imager, the concentration of FUR can be easily read, thus shedding a new light in the construction of visual sensor for simple and low‐cost point‐of‐care testing.

Thermal‐Responsive Gel‐Based Overheat Limiter Enabled Intelligent Photothermal Therapy

“…[8,9] Therefore, considerable efforts have been made to improve the photothermal conversion efficiency of PCAs or develop innovative strategies for enhancing light delivery through biological tissues to generate sufficient heat to achieve the thorough ablation of abnormal cells. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Unfortunately, the actual therapeutic temperature during the treatment is arduous to precisely monitor and control, and as a result, pursuing the highest treatment temperature is the best option to achieve the desired therapeutic efficiency, which probably carries a risk of thermal damage to the surrounding tissue. It is reported that the highest temperature of the skin surface near the lesion tissue could reach temperatures as high as 60 °C or even 70 °C during PTT, which is bound to cause empyrosis to the skin tissue, as well as other surrounding tissues.…”

Distance-Based Self-Powered Signal Transduction of Ion-Selective Electrodes to an Electronic Paper Display Array

“…From the connected sensing system, quantitative information on the analyte concentration or activity responsible for the voltage signal is then revealed. PB has been widely used in the detection of pollutants, ions, and mycotoxins. − PB films are not without challenges, including a limited stability, the need for a contacting electrolyte solution, a prolonged response time, and a narrow response range of about 100 mV that limits the dynamic range of the resulting sensor …”