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Ye T, Sun YY, Kocherga M, Nesmelov A, Schmedake TA, Zhang Y. Degradation Kinetics of Organic-Inorganic Hybrid Materials from Micro-Raman Spectroscopy and Density-Functional Theory: The Case of β-ZnTe(en) 0.5. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2302935. [PMID: 37322314 DOI: 10.1002/smll.202302935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/28/2023] [Indexed: 06/17/2023]
Abstract
Organic-inorganic hybrid materials often face a stability challenge. β-ZnTe(en)0.5 , which uniquely has over 15-year real-time degradation data, is taken as a prototype structure to demonstrate an accelerated thermal aging method for assessing the intrinsic and ambient-condition long-term stability of hybrid materials. Micro-Raman spectroscopy is used to investigate the thermal degradation of β-ZnTe(en)0.5 in a protected condition and in air by monitoring the temperature dependences of the intrinsic and degradation-product Raman modes. First, to understand the intrinsic degradation mechanism, the transition state of the degradation is identified, then using a density functional theory, the intrinsic energy barrier between the transition state and ground state is calculated to be 1.70 eV, in excellent agreement with the measured thermal degradation barrier of 1.62 eV in N2 environment. Second, for the ambient-condition degradation, a reduced thermal activation barrier of 0.92 eV is obtained due to oxidation, corresponding to a projected ambient half-life of 40 years at room temperature, in general agreement with the experimental observation of no apparent degradation over 15 years. Furthermore, the study reveals a mechanism, conformation distortion enhanced stability, which plays a pivotal role in forming the high kinetic barrier, contributing greatly to the impressive long-term stability of β-ZnTe(en)0.5 .
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Affiliation(s)
- Tang Ye
- Nanoscale Science, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
| | - Yi-Yang Sun
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China
| | - Margaret Kocherga
- Nanoscale Science, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
| | - Andrei Nesmelov
- Department of Chemistry, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
| | - Thomas A Schmedake
- Nanoscale Science, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
- Department of Chemistry, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
| | - Yong Zhang
- Nanoscale Science, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
- Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
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