Das Partha Pratim, Devi P Sujatha, Blom Douglas A, Vogt Thomas, Lee Yongjae
Department of Earth System Sciences, Yonsei University, Seoul 120749, Korea.
Sensor and Actuator Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India.
ACS Omega. 2019 Jun 18;4(6):10539-10547. doi: 10.1021/acsomega.9b01361. eCollection 2019 Jun 30.
Many aspects of nanostructured materials at high pressures are still unexplored. We present here, high-pressure structural behavior of two ZnSnO nanomaterials with inverse spinel type, one a particle with size of ∼7 nm [zero dimensional (0-D)] and the other with a chain-like [one dimensional (1-D)] morphology. We performed in situ micro-Raman and synchrotron X-ray diffraction measurements and observed that the cation disordering of the 0-D nanoparticle is preserved up to ∼40 GPa, suppressing the reported martensitic phase transformation. On the other hand, an irreversible phase transition is observed from the 1-D nanomaterial into a new and dense high-pressure orthorhombic CaFeO-type structure at ∼40 GPa. The pressure-treated 0-D and 1-D nanomaterials have distinct diffuse reflectance and emission properties. In particular, a heterojunction between the inverse spinel and quenchable orthorhombic phases allows the use of 1-D ZnSnO nanomaterials as efficient photocatalysts as shown by the degradation of the textile pollutant methylene blue.
高压下纳米结构材料的许多方面仍未被探索。我们在此展示了两种具有反尖晶石型的ZnSnO纳米材料在高压下的结构行为，一种是尺寸约为7 nm的颗粒[零维(0-D)]，另一种是链状[一维(1-D)]形态。我们进行了原位微拉曼和同步加速器X射线衍射测量，观察到0-D纳米颗粒的阳离子无序在高达约40 GPa时得以保留，抑制了报道的马氏体相变。另一方面，在约40 GPa时观察到从1-D纳米材料到一种新的致密高压正交CaFeO型结构的不可逆相变。经过压力处理的0-D和1-D纳米材料具有不同的漫反射和发射特性。特别是，反尖晶石相和可淬火正交相之间的异质结使得1-D ZnSnO纳米材料能够作为高效光催化剂，如纺织污染物亚甲基蓝的降解所示。
