Abstract Rare earth (La, Pr, Sm, Ce and Yb)-doped porous In 2 O 3 nanosheets are prepared by a solvothermal method. The effect of rare earth elements on the structure, morphologies and gas-sensing performance of In 2 O 3 nanosheets is systematically investigated. The mixed phase composed of c-In 2 O 3 and rh-In 2 O 3 can be transformed into rh-In 2 O 3 by doping with rare earth elements. After doping with rare earth elements, the morphology can be changed from compact nanosheets to porous sheets. Compared with pure In 2 O 3 and La, Pr, Sm, Ce-doped porous In 2 O 3 nanosheets, Yb-doped In 2 O 3 nanosheets present the best gas-sensing performance. Among 3%–10% Yb-doped samples, 6% Yb-doped In 2 O 3 porous nanosheets exhibit the optimal gas-sensing performance to 5 × 10 −6 –750 × 10 −6 acetone, giving a high response of 15.3 toward 50 × 10 −6 acetone and fast response/recovery time at the operating temperature of 220 °C. Moreover, 6% Yb-doped porous In 2 O 3 nanosheet sensor also exhibits excellent selectivity and stability, indicating its potential in the next-generation gas sensor. Graphic abstract

中文翻译：

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稀土元素掺杂的多孔 In2O3 纳米片增强气敏性能

摘要 采用溶剂热法制备了稀土（La、Pr、Sm、Ce 和Yb）掺杂的多孔In 2 O 3 纳米片。系统研究了稀土元素对In 2 O 3 纳米片结构、形貌和气敏性能的影响。由c-In 2 O 3 和rh-In 2 O 3 组成的混合相可以通过掺杂稀土元素转化为rh-In 2 O 3 。掺杂稀土元素后，形态可以从致密的纳米片变为多孔片。与纯In 2 O 3 和La、Pr、Sm、Ce掺杂的多孔In 2 O 3 纳米片相比，Yb掺杂的In 2 O 3 纳米片表现出最好的气敏性能。在 3%–10% Yb 掺杂样品中，6% Yb 掺杂 In 2 O 3 多孔纳米片对 5 × 10 -6 –750 × 10 -6 丙酮表现出最佳气敏性能，响应高达 15。3 对 50 × 10 -6 丙酮和快速响应/恢复时间在 220 °C 的工作温度。此外，6% Yb 掺杂的多孔 In 2 O 3 纳米片传感器还表现出优异的选择性和稳定性，表明其在下一代气体传感器中的潜力。图形摘要