Liquid-Metal-Based Spin-Coating Exfoliation for Atomically Thin Metal Oxide Synthesis.

Two-dimensional (2D) semiconductors possess exceptional electronic, optical, and magnetic properties, making them highly desirable for widespread applications. However, conventional mechanical exfoliation and epitaxial growth methods are insufficient in meeting the demand for atomically thin films covering large areas while maintaining high quality. Herein, leveraging liquid metal oxidation reaction, we propose a motorized spin-coating exfoliation strategy to efficiently produce large-area 2D metal oxide (2DMO) semiconductors with high crystallinity, atomically thin thickness, and flat surfaces on diverse substrates. Moreover, we realized a 2D gallium oxide-based deep ultraviolet solar-blind photodetector featuring a metal-semiconductor-metal structure, showcasing high responsivity (8.24 A W-1) at 254 nm and excellent sensitivity (4.3 × 1012 cm Hz1/2 W-1). This novel liquid-metal-based spin-coating exfoliation strategy offers great potential for synthesizing atomically thin 2D semiconductors, opening new avenues for future functional electronic and optical applications.

[A clinic study on treatment of chronic frontal sinusitis with endoscopic surgery and permanent implantation of a place holder].

OBJECTIVE: To investigate the characteristics of chronic frontal sinusitis and to improve the clinical therapeutic efficacy. METHOD: Sixty-eight patients (130 sides) who underwent endoscopic frontal sinus surgery in our department were randomly divided into three groups: Group 1 included 23 patients (43 operations) underwent endonasal sinus surgery with the frontal sinus opened and drained by two pipes of silicone for 6 months. Group 2 included 24 patients (45 operations) treated as group 1 but added injection of beclomethasone (approximately 1 cc, 94 mcg/100 microliters). Group 3 included 21 patients (42 operations) with only frontal sinus opened. RESULT: After an average follow-up of 18 months, the cure rate in group 1, group 2 and group 3 was 93%, 93% and 71% respectively. CONCLUSION: The ultimate success or failure of frontal sinus surgical procedures, whether they are endonasal or external, depends on the restenosis of the frontal sinus outflow tract or neo-ostium postoperatively. Long-term stenting for a period of several months will significantly reduce the possibility of restenosis. We recommend that this type of management be considered in difficult revision cases and before performing an external operation.