Multilayer-assembled ZnO nanoplates (NP-ZnO) were synthesized, and the relationship between the exposed facets and the sensing performance was investigated. The XRD results showed that NP-ZnO predominantly exposed polar (0001) facets (I₀₀₀₂/I₁₀₁₀ = 2.9), while the PL and XPS spectra indicated that it contained very few oxygen vacancies. For comparison, ZnO nanosheet assemblies and ZnO commercial powder, both with less exposed (0001) facets but much more oxygen vacancies, were also studied. In the gas sensing test, the NP-ZnO sensor displayed the best sensing performance among the three ZnO microstructures sensor. The XPS analysis further confirmed that NP-ZnO was able to adsorb more oxygen species, despite having very few oxygen vacancies. These results revealed that: i) although more oxygen vacancies are generally considered the main reason for the high sensing activity of the (0001) polar facets, this might not be the dominant factor in NP-ZnO; ii) in NP-ZnO, the (0001) facets with few oxygen vacancies displayed an excellent sensing performance mainly due to its special atomic structure.

中文翻译：

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具有高度暴露的（0001）面的ZnO纳米板的原子结构主导的丙酮感测增强

合成了多层组装的ZnO纳米板（NP-ZnO），研究了其暴露面与传感性能之间的关系。XRD结果表明NP-ZnO主要暴露了极性（0001）面（I ₀₀₀₂ / I ₁₀₁₀= 2.9），而PL和XPS光谱表明它几乎没有氧空位。为了进行比较，还研究了具有较少暴露（0001）面但具有更多氧空位的ZnO纳米片组件和ZnO商业粉末。在气体传感测试中，NP-ZnO传感器在三个ZnO微结构传感器中表现出最佳的传感性能。XPS分析进一步证实，尽管氧空位非常少，但是NP-ZnO能够吸附更多的氧。这些结果表明：i）尽管通常认为更多的氧空位是（0001）极性小面高感应活性的主要原因，但这可能不是NP-ZnO的主要因素；ii）在NP-ZnO中，氧空位少的（0001）面显示出优异的感测性能，这主要是由于其特殊的原子结构。