CN111172535B - 一种在不锈钢表面一步生长二氧化钛纳米花薄膜的方法 - Google Patents
一种在不锈钢表面一步生长二氧化钛纳米花薄膜的方法 Download PDFInfo
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Abstract
本发明公开一种在不锈钢表面一步生长二氧化钛纳米花薄膜的方法。将清洗干燥后的不锈钢片浸没于添加了硝酸的双氧水溶液中,以海绵钛为钛源,在80~90℃下保温24~48小时,即可在不锈钢表面覆盖均匀的二氧化钛纳米花薄膜。本发明方法简便、成本低,所制备的纳米花状二氧化钛薄膜均匀覆盖不锈钢表面,结合牢固,可应用于自清洁、杀菌、光催化等领域。
Description
技术领域
本发明公开一种在不锈钢表面一步生长TiO2纳米花薄膜的技术,可在自清洁、杀菌、污水处理、大气治理等方面获得应用,属环保和新材料领域。
背景技术
TiO2作为一种过渡金属氧化物,因为具有高的可见光透过率、良好的化学稳定性以及无毒、环境友好等特性,在光催化有机污染物降解、光解水制氢、染料敏化太阳能电池、灭菌、自清洁、气体传感等诸多领域都有巨大的应用。基于其应用的广泛性,在金属、玻璃、陶瓷等不同类型的材料表面生长具有特殊纳米结构及特殊物理化学特性的TiO2薄膜具有重要意义。
不锈钢耐蚀性好,价格便宜,在日常生活和工业中应用广泛。在不锈钢表面引入TiO2功能涂层,可赋予其额外的杀菌、自清洁等特性,拓展其应用领域。作为TiO2载体,不锈钢具有显著的优势:耐腐蚀、耐高温、柔韧性好、价格低廉。CN1634653A公布了一种以不锈钢丝网为载体,采用溶胶凝胶技术制备纳米TiO2薄膜的方法。该方法所制备的TiO2为零维纳米颗粒,相对于一维、三维等纳米结构,表面积相对较小,作为光催化剂应用时,光子利用率低,活性位点有限,同时不利于光生载流子的有效分离。CN103290417A公布了一种不锈钢表面生长一维纳米管结构TiO2薄膜的制备方法。该方法结合双层辉光离子渗金属和阳极氧化法等技术,工艺相对复杂,设备要求高。本课题组之前公布了一种在不锈钢丝网表面制备TiO2纳米线阵列薄膜的方法(发明专利号ZL201310541801.4),首先采用溶胶凝胶技术在不锈钢丝网表面制备TiO2籽晶层,而后在籽晶层上生长TiO2纳米线阵列,制备过程多步,且涉及成本较高的溶胶凝胶技术。
发明内容
本发明的目的在于针对现有技术的不足,提供一种在不锈钢表面一步生长TiO2纳米花薄膜的技术,方法简便,成本较低,工业化应用前景好。其主要步骤如下:
1)配置反应液
在质量百分比浓度为15~30%的双氧水中,添加0.14~0.28摩尔/升硝酸,得到反应液。
2)生长TiO2纳米花结构薄膜
将清洗干燥后不锈钢片浸没于反应液中,并加入过量海绵钛作为钛源,在80~90℃下反应24~48小时,即可在不锈钢表面均匀覆盖纳米花状薄膜。
本发明在低温液相中在不锈钢表面一步生长纳米花薄膜。所得薄膜对反应时间、双氧水浓度等过程参数不敏感,简单易行,重复性好。与其他技术相比,本发明方法制备技术工艺简单,无需对不锈钢进行预处理、无需昂贵试剂或复杂设备、无需高温高压等苛刻条件,反应条件温和,可控性好,适合于大面积生产,且制备的纳米花属于三维纳米结构,与零维的纳米颗粒、一维的纳米管与纳米线等纳米结构相比具有更高的表面积,有利于光催化效率的提高,可望在环境保护、灭菌等领域获得实际应用。
附图说明
图1为实施例1制备的表面覆盖TiO2纳米花薄膜的不锈钢片的低倍场发射扫描电子显微镜照片;
图2为实施例1制备的表面覆盖TiO2纳米花薄膜的不锈钢片的高倍场发射扫描电子显微镜照片;
图3为实施例1制备的表面覆盖TiO2纳米花薄膜的不锈钢片的X射线衍射谱;
图4为实施例2制备的表面覆盖TiO2纳米花薄膜的不锈钢片的低倍场发射扫描电子显微镜照片;
图5为实施例2制备的表面覆盖TiO2纳米花薄膜的不锈钢片的高倍场发射扫描电子显微镜照片;
图6为实施例2制备的表面覆盖TiO2纳米花薄膜的不锈钢片的高倍场发射扫描电子显微镜照片;
图7为实施例3制备的表面覆盖TiO2纳米花薄膜的不锈钢片的低倍场发射扫描电子显微镜照片;
图8为实施例3制备的表面覆盖TiO2纳米花薄膜的不锈钢片的高倍场发射扫描电子显微镜照片;
图9为实施例4制备的表面覆盖TiO2纳米花薄膜的不锈钢片的低倍场发射扫描电子显微镜照片;
图10为实施例4制备的表面覆盖TiO2纳米花薄膜的不锈钢片的高倍场发射扫描电子显微镜照片;
具体实施方式
以下结合实施例进一步阐述本发明在不锈钢表面一步生长纳米花TiO2薄膜的方法,但本发明不仅仅局限于下述实施例。所得纳米花薄膜为结晶良好的金红石结构TiO2薄膜,厚度约300~400纳米,与不锈钢基体结合牢固。
实施例1
步骤1配置反应液
在质量百分比浓度为30%的双氧水中,添加0.28摩尔/升硝酸,得到反应液。
步骤2生长纳米花薄膜
将清洗干燥后304不锈钢浸没于反应液中,加入0.25克海绵钛作为钛源,在80℃下反应24小时。
反应结果
图1低倍扫描电子显微镜照片表明,不锈钢表面均匀覆盖纳米花薄膜。图2高倍扫描电子显微镜图片表明,纳米花的尺度在300~500nm左右,不同纳米花的大小有一定差别。图3的X射线衍射结果表明,纳米花薄膜为结晶良好的金红石相TiO2。
实施例2
步骤1配置反应液
同实施例1。
步骤2生长纳米花薄膜
将清洗干燥后304不锈钢浸没于反应液中,加入0.25克海绵钛作为钛源,在80℃下反应48小时。
反应结果
图4低倍扫描电子显微镜照片表明,纳米花薄膜生长密集;图5高倍扫描电子显微镜照片表明,与实施例1比较,所得纳米花形貌接近。图6高倍扫描电子显微镜照片表明,纳米花薄膜的厚度在400nm左右。
实施例3
步骤1配置反应液
在质量百分比浓度为15%的双氧水中,添加0.14摩尔/升硝酸,得到反应液。
步骤2生长纳米花薄膜
同实施例2。
反应结果
图7低倍扫描电子显微镜照片表明,不锈钢表面均匀覆盖纳米花薄膜,其上分布少量纳米花颗粒;图8高倍扫描电子显微镜照片表明,相对于实施例1、2反应获得的形貌,纳米花的尺度略微变小,尺寸更均匀。
实施例4
步骤1配置反应液
在质量百分比浓度为30%的双氧水中,添加0.28摩尔/升硝酸,得到反应液。
步骤2生长纳米花薄膜
将清洗干燥后304不锈钢浸没于反应液中,加入0.25克海绵钛作为钛源,在90℃下反应24小时。
反应结果
图9、10扫描电子显微镜照片表明,不锈钢片表面覆盖纳米花薄膜,但均匀性较差。
Claims (1)
1.一种在不锈钢表面一步生长TiO2纳米花薄膜的方法,其特征在于,过程是:将不锈钢片浸没于质量百分比浓度为15~30%的双氧水中,同时添加0.14~0.28摩尔/升硝酸,并加入过量海绵钛作为钛源,在80~90℃下反应24~48小时,即可在不锈钢表面均匀覆盖纳米花状TiO2薄膜。
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