3D hierarchically porous ZnO structures and their functionalization by Au nanoparticles for gas sensors
3D hierarchically porous ZnO structures and their functionalization by Au nanoparticles for gas sensors
复制标题
用于气体传感器的 3D 分层多孔 ZnO 结构及其金纳米颗粒的功能化
DOI：
10.1039/c0jm01800g
复制
发表时间：
2011-01-01
影响因子：
--
通讯作者：
Wang, Shurong
中科院分区：
文献类型：
--
作者：
Liu, Xianghong;Zhang, Jun;Wang, Shurong
具有可控形貌和尺寸的三维（3D）分级多孔纳米结构是一类重要的材料，由于其广泛的应用而受到人们的关注。本论文采用氨基酸辅助仿生水热法结合后续煅烧合成了三维多级孔结构的ZnO。首先合成了由相互连接的纳米片组装而成的片状球形形貌的碱性碳酸锌（BZC）前体。通过随后的煅烧，所获得的BZC前体可以容易地转化为具有193.7 m2/g的大表面积的多孔ZnO，同时保持其3D分级形貌。该三维分级多孔ZnO超结构进一步被用作负载Au纳米颗粒（AuNPs）的载体，以构建用于化学气体传感器的杂化纳米材料。AuNP功能化的3D分级多孔ZnO纳米材料结合了多孔材料的高表面可及性和小AuNP的催化活性，在更高的灵敏度和非常快的响应方面表现出优异的传感器性能。此外，预计这种AuNP功能化的3D分级多孔纳米结构可以为开发用于气体传感器，低温CO氧化和催化剂等应用的先进纳米材料提供新的途径。
Three-dimensional (3D) hierarchically porous nanostructures with controlled morphology and dimensionality represent one kind of important material and have received enormous attention for a series of applications. In this work, 3D hierarchically porous ZnO architectures were synthesized via an amino acid-assisted biomimetic hydrothermal method combined with subsequent calcination. First a basic zinc carbonate (BZC) precursor with a lamellar spherical morphology assembled by interconnected nanosheets was synthesized. By subsequent calcination, the as-obtained BZC precursor can be facilely transformed into porous ZnO with a large surface area of 193.7 m2/g, while maintaining its 3D hierarchical morphology. The 3D hierarchically porous ZnO superstructures are further employed as a support to load Au nanoparticles (AuNPs) to construct hybrid nanomaterials for chemical gas sensors. The AuNP-functionalized 3D hierarchically porous ZnO nanomaterials, combining the high surface accessibility of porous materials and catalytic activity of small AuNPs, demonstrated excellent sensor properties in terms of higher sensitivity and very fast response. Furthermore, it is expected this AuNP-functionalized 3D hierarchically porous nanostructure may provide a new pathway to develop advanced nanomaterials for applications like gas sensors, low temperature CO oxidation and photocatalysis.