材料科学                        
                
                                
                        
                            飞秒                        
                
                                
                        
                            环氧树脂                        
                
                                
                        
                            傅里叶变换红外光谱                        
                
                                
                        
                            热稳定性                        
                
                                
                        
                            聚合                        
                
                                
                        
                            激光器                        
                
                                
                        
                            光学                        
                
                                
                        
                            化学工程                        
                
                                
                        
                            复合材料                        
                
                                
                        
                            聚合物                        
                
                                
                        
                            物理                        
                
                                
                        
                            工程类                        
                
                        
                    
            作者
            
                Gan Fang,Hong-Zhong Cao,Liangcheng Cao,Xuan‐Ming Duan            
         
                    
        
    
            
            标识
            
                                    DOI:10.1002/admt.201700271
                                    
                                
                                 
         
        
                
            摘要
            
            Abstract Given the importance of epoxy cyclohexyl polyhedral oligomeric silsesquioxane (epoxy‐POSS) as a silica‐like hybrid material of optical clarity, high thermal and mechanic stability, the two‐photon initiated polymerization of epoxy‐POSS using diphenyliodonium hexafluorophosphate as photoacid generators for UV lithography and femtosecond laser direct writing is studied. The hybrid resist exhibits high thermal stability: decomposition temperatures are found at ≈350 and 400 °C when calcined in air and argon, respectively. The corresponding calcined products are found as silica‐like structures with chemical formulas of C 1.5 SiO 3.5 and C 5 SiO 3 , evidenced by energy dispersive X‐ray analysis (EDX), fourier‐transform infrared spectroscopy (FTIR), and elemental analysis. An equation regarding the two‐photon polymerized line width as functions of intensity of laser ( P laser ) and scanning speed ( V ) is proposed in describing the effect of Gaussian light on polymerized lines. Experimental verification of the equation is given to prove a nonlinear optical process. Line width with a resolution of 250 nm is achieved on a glass substrate, while the resolution is 400 nm when fabricated on a silicon wafer. 3D structured woodpiles are fabricated and show no volumetric shrinkage upon 300 °C calcination in air environment, demonstrating a high thermal stability.
         
            
 
                 
                
                    
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