| Due to the excellent chemical stability,biocompatibility and electrochemical activity,titanium-based composite materials have important application prospects in the fields of biomedicine,energy storage and conversion.As one of the advanced additive manufacturing methods,the selective laser melting method provides new ideas for the design and manufacture of three-dimensional titanium-based complex structure integration.Therefore,titanium matrixes with different complex shapes and high specific surface area were prepared by selective laser melting method.Then,the prepared titanium matrix was respectively anodized and annealed with acetone to further increase the specific surface area of the titanium matrix.Finally,titanium-based composite materials such as TiO2@C nanotube arrays,TiN nanotube arrays,and Ni-Ni0.2Mo0.8N/TiO2@C micro/nanorods were respectively obtained by modified treatments of carbonization,nitrogenization and supported catalysts.The effects of dopamine concentration and heat treatment temperature on the preparation of TiO2@C nanotube arrays were studied respectively;the effects of heat treatment temperature on the preparation of TiN nanotube arrays and the effect of ammonium molybdate and nickel nitrate concentrations on the preparation of Ni-Ni0.2Mo0.8N/TiO2@C micro/nanorods were studied respectively.The results demanstrated that:(1)Titanium matrixes with the shape of micro-cylindrical arrays and tic tac toe were respectively prepared by selective laser melting method.TiO2 nanotube arrays were obtained on the prepared titanium matrix after 90 s chemical polishing,anodizing treatment for 30 min and annealing treatment at 450?/3 h in air.And the obtained TiO2 nanotube arrays were immersed in the 0.1 mg·mL-1 dopamine solution for 12 h before the carbonization at 650?/3 h to prepare TiO2@C nanotube arrays.TiO2@C nanotube arrays prepared on the titanium matrix with micro cylindrical arrays were directly used as self-supporting biosensor.The limitation of detectation and sensitivity for ascorbic acid were 0.6 ?mol·L-1 and 1036.1 ?A·?mol·L-1·cm-2 respectively.The limitation of detectation and sensitivity for uric acid were respectively 0.2 ?tmol·L-1 and 111.1 ?A·?mol·L-1·cm-2.TiO2@C nanotube arrays were prepared on the titanium matrix with the shape of tic tac toe were similarly used as self-supporting biosensor.The limitation of detectation and sensitivity for ascorbic acid were respectively 0.4?mol·L-1 and 11156.1 ?A·?mol·L-1·cm-2.The limitation of detectation and sensitivity for uric acid were 0.02 ?mol·L-1 and 54.4 ?A·?mol·L-1·cm-2 respectively(2)TiN nanotube arrays were obtained by anodizing,annealing in air and nitriding treatment of the three-layer hexagonal turning tac-tic-toe-shaped titanium matrix and the five-layer hexagonal turning tac-tic-toe-shaped titanium matrix that were prepared by the selective laser melting method.The optimal temperature of TiN nanotube arrays respectively prepared by three-layer hexagonal turning tac-tic-toe-shaped titanium matrix and five-layer hexagonal turning tac-tic-toe-shaped titanium matrix were 700? and 800?,and the obtained specific capacitance retention rates were 83%and 80%;values of Cd1 were 135.2 mF·cm-2 and 134.4 mF·cm-2;At a current density of 2 mA·cm-2,the specific capacities can be respectively maintained 70%and 80%after 3000 charge and discharge cycles(3)TiO2@C nanorods were obtained by acetone heat treatment at 800?/1.5 h of the titanium matrix with micron cylindrical arrays and a square base prepared by the selective laser melting method.Subsequently,Ni-Ni0.2Mo0.8N/TiO2@C micro/nanorods self-supporting electrodes were prepared by the hydrothermal treatment with 0.05 mol·L-1 nickel nitrate and 0.01 mol·L-1 ammonium molybdate at 150?/6 h and heat treatment at 500?/2 h.The ?0,?10 and tafel slope of Ni-Ni0.2Mo0.8N/TiO2@C micro/nanorods electrodes were respectively 0 mV,42 mV and 85 mV-dec-1.The electrode worked continuously for 24 h at a current density of 100 mA·cm-2 and showed excellent stability. |
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