【作者】 王德良； 杜娜； 李海平； 侯万国；

【Author】 Deliang Wang;Na Du;Haiping Li;Wanguo Hou;The Key Laboratory of Colloid and Interface Chemistry (Ministry of Education),Shandong University;

【机构】 山东大学化学与化工学院；

【摘要】 单层过渡金属氧化物（TMOs）纳米片,尤其是最具代表性的氧化钨（WO₃、WO₃·H₂O）纳米片由于其优异的性能和广泛的应用前景而受到广泛关注^[1,2]。然而,与具有层状晶体结构的过渡金属硫化物（TMDs）不同,由于其晶体结构中具有较强的面外原子键合力,大多数TMOs很难直接剥离成纳米片^[3,4]。本文采用一种空间限域合成策略,成功制备出单层WO₃和WO₃·H₂O纳米片。以层状双氢氧化物（LDHs）的层间空间作为纳米反应器,现将H₂W₁₂O₄₀^-6插入其层间,然后经过煅烧,酸溶去除层板后制备单层WO₃·H₂O纳米片,再经低温煅烧可直接转化为单层WO₃纳米片。LDHs的层间空间只允许晶体的二维生长,故形成单层WO₃·H₂O纳米片;在低温条件下煅烧WO₃·H₂O纳米片,发现水分子被脱除过程可阻止纳米片的堆积,得到单层WO₃纳米片。AFM表征表明确定WO₃·H₂O和WO₃纳米片的厚度分别为～1.0和1.3 nm,单层片率高达90%以上。采用TEM表征了其晶体结构和形貌。本工作为宏量制备单层TMOs纳米材料提供了一条有效的途径。更多还原

【Abstract】 Monolayer transition metal oxides （TMOs） nanosheets,especially promising tungsten oxide（WO₃ and WO₃·H₂O） have attracted tremendous attention owing to their extraordinary properties and extensive potential applications.However,unlike layered transition metal dichalcogenides（TMDs）,most of TMOs are difficult to be directly exfoliated into nanosheets due to their strong atomic bonding in the out-of-plane direction in a crystal system.Herein,a novel space-confined synthesis strategy is developed for monolayer WO₃ and WO₃·H₂O nanosheets,using the interlayer spaces of layered double hydroxides （LDHs） as nanoreactors.The H₂W₁₂O₄₀^-6 anions are intercalated into the interlayer spaces of LDHs,followed by calcination and acid-dissolving host layers,resulting monolayer WO₃·H₂O nanosheets.The resultant monolayer WO₃·H₂O nanosheets can be directly transformed into monolayer WO₃ by calcination.The interlayer spaces of LDHs only allow the 2D growth of WO₃·H₂O crystals,resulting in monolayer nanosheets.The thicknesses of the WO₃·H₂O and WO₃ nanosheets are determined using AFM to be～1.0 and 1.3 nm,respectively.The monolayer ratio of the nanosheets is up to 90%.This work provides an effective route for large-scale fabrication of monolayer TMOs nanomaterials.更多还原