Synthesis and characterization of black TiO2 nanoparticles by pulsed laser irradiation in liquid
Synthesis and characterization of black TiO2 nanoparticles by pulsed laser irradiation in liquid
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DOI：
10.1016/j.apsusc.2019.03.302
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发表时间：
2019-07
影响因子：
6.7
通讯作者：
V. A. Zuñiga-Ibarra;S. Shaji;B. Krishnan;J. Johny;Sreed Sharma Kanakkillam;D. Avellaneda;J. A. A. Martínez-J.-A.-A.-Martínez-93665375;T. K. Roy;N. Ramos-Delgado
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文献类型：
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作者：
V. A. Zuñiga-Ibarra;S. Shaji;B. Krishnan;J. Johny;Sreed Sharma Kanakkillam;D. Avellaneda;J. A. A. Martínez-J.-A.-A.-Martínez-93665375;T. K. Roy;N. Ramos-Delgado
通过不同方法生产的改性TiO2（黑色TiO2）纳米粒子（NPs）比普通白色TiO2NPs表现出增强的可见光吸收能力。液体中脉冲激光烧蚀 (PLAL) 是一种很有前途的合成纳米结构的技术，因为它简单、有毒试剂的使用较少且无需昂贵的真空系统。在本研究中，研究了通过脉冲激光照射合成的黑色 TiO2NPs 的结构、形态和光学性质。使用 Nd:YAG 激光（532nm，10ns，10Hz）照射水中的白色 TiO2 粉末，通过液体技术中的脉冲激光烧蚀制备改性 TiO2 纳米颗粒。通过扫描电子显微镜（SEM）对纳米粒子形态的表征表明，激光照射后，TiO2 纳米粒子的形态发生了变化。通过 X 射线衍射 (XRD) 测定晶体结构，其中白色 TiO2 中的主要锐钛矿相在辐照过程中变为金红石相，并且对于较长的辐照，金红石相成为主要相。 TiO2 的大部分振动峰均在拉曼光谱中被识别。通过X射线光电子能谱（XPS）对黑色TiO2（90分钟）的Ti 2p 和O 1s 结合能分析显示，由于化学态的变化，与白色TiO2相比，Ti 2p 和O 1s 结合能分别变化了0.5eV和0.7eV。使用漫反射光谱测量进行光学吸收和带隙评估，结果显示所有激光照射的纳米颗粒在可见光范围内的吸收增强，带隙从白色 TiO2 的 2.98eV 降低到黑色 TiO2 的 1.84eV。首次报道了在正常大气条件下通过使用 532nm 激光输出（一种非常常见的 Nd:YAG 波长）照射液体中的 TiO2 来合成黑色 TiO2。
Modified TiO2(black TiO2) nanoparticles (NPs) produced by different methods showed enhanced visible light absorption than ordinary white TiO2NPs. Pulsed laser ablation in liquid (PLAL) is a promising technique for synthesizing nanostructures due to its simplicity, less usage of toxic reagents and absence of costly vacuum systems. In the present study, black TiO2NPs synthesized by pulsed laser irradiation is examined for their structure, morphology and optical properties. Nanoparticles of modified TiO2were prepared by pulsed laser ablation in liquid technique by irradiating white TiO2powder in water using an Nd:YAG laser (532 nm, 10 ns, 10 Hz). Characterization of morphology of the nanoparticles by scanning electron microscopy (SEM) showed a change in morphology by laser irradiation for TiO2nanoparticles. Crystalline structure was determined by X-ray diffraction (XRD) in which the major anatase phase in white TiO2was changed to rutile during irradiation and for longer irradiation, rutile became the major phase. Most of the vibrational peaks for TiO2were identified in Raman spectra. Ti 2p and O 1s binding energy analysis by X-ray photoelectron spectroscopy (XPS) for black TiO2(90 min) showed changes of 0.5 eV and 0.7 eV respectively compared to the white TiO2due to their change in chemical states. Optical absorption and band gap evaluation were done using the diffuse reflectance spectra measurements that showed enhanced absorption in the visible range for all the laser irradiated nanoparticles and a decrease in the bandgap from 2.98 eV of white TiO2to 1.84 eV for black TiO2. Synthesis of black TiO2at normal atmospheric conditions by irradiation of TiO2in liquid using 532 nm laser output which is a very common Nd:YAG wavelength is reported for the first time.