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Gyawali S, Tirumala RTA, Loh H, Andiappan M, Bristow AD. Photocarrier Recombination Dynamics in Highly Scattering Cu 2O Nanocatalyst Clusters. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:2003-2011. [PMID: 38352855 PMCID: PMC10860136 DOI: 10.1021/acs.jpcc.3c06941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 01/07/2024] [Accepted: 01/09/2024] [Indexed: 02/16/2024]
Abstract
Inversion analysis of transient absorption data to capture the photoexcited charge carrier population rate dynamics is a powerful technique for extracting realistic lifetimes and identifying recombination pathways. However, for highly scattering samples such as Cu2O nanoparticles (NPs) with associated dielectric Mie scattering, the scattering leads to an inaccurate measure of the excited photocarrier. This work studies methods to correct for the scattering to generalize the use of inversion analysis and provide secondary information about the nature of the scattering NPs. Scattering profiles of semitransparent disks containing Cu2O NPs with different shapes and sizes are measured to demonstrate that the inclusion of scattering in analysis reduces the photoexcited carrier density by 1 order of magnitude. It is found that the photocarrier density response is affected by shape rather than size. A Fourier transform of the scattering profiles produces a distribution of length scales within the sample characteristic of the mean separation of scatterers. This analysis reveals that NPs are forming clusters. Links are made between the scattering and carrier dynamics.
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Affiliation(s)
- Sunil Gyawali
- Department
of Physics and Astronomy, West Virginia
University, Morgantown, West Virginia 26506, United States
| | - Ravi Teja A. Tirumala
- School
of Chemical Engineering, Oklahoma State
University, Stillwater, Oklahoma 74078, United States
| | - Harrison Loh
- Department
of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Marimuthu Andiappan
- School
of Chemical Engineering, Oklahoma State
University, Stillwater, Oklahoma 74078, United States
| | - Alan D. Bristow
- Department
of Physics and Astronomy, West Virginia
University, Morgantown, West Virginia 26506, United States
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Zhang W, Li Z, Wu G, Wu W, Zeng H, Jiang H, Zhang W, Wu R, Xue Q. Preparation, Chromatic Properties Analysis and Proportioning Optimization of Co-Cr-Fe-Based Black Pigment. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5785. [PMID: 37687477 PMCID: PMC10488638 DOI: 10.3390/ma16175785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 08/17/2023] [Accepted: 08/18/2023] [Indexed: 09/10/2023]
Abstract
The utilization of Co-Cr-Fe-based black pigments bears considerable significance within the realm of commercial ceramic pigments, owing to their distinctive spinel structure, remarkable high-temperature stability, and exceptional chromatic attributes. This study delves into the synthesis of diverse black pigment configurations by employing the co-precipitation method, leveraging the interplay of these three metallic oxides. This investigation encompasses a comprehensive scrutiny of ion valences, crystal structures and parameters, colorimetric properties, and their interrelationships. The methodology integrates the response surface methodology (RSM) framework, using theoretical formulations to navigate the material ratios and elucidating the associations between the resultant compositions and color coordinate values, aligned with the CIE-Lab* colorimetric methodology. The derived predictive models yielded an optimized black pigment composition, characterized by heightened black intensity and a refined formulation.
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Affiliation(s)
- Weiran Zhang
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
- National and Local Joint Engineering Research Center for Advanced Packaging Material and Technology, Hunan University of Technology, Zhuzhou 412007, China
| | - Ziyu Li
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
- National and Local Joint Engineering Research Center for Advanced Packaging Material and Technology, Hunan University of Technology, Zhuzhou 412007, China
| | - Guohua Wu
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
- National and Local Joint Engineering Research Center for Advanced Packaging Material and Technology, Hunan University of Technology, Zhuzhou 412007, China
| | - Wei Wu
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
| | - Hailan Zeng
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
| | - Haiyun Jiang
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
- National and Local Joint Engineering Research Center for Advanced Packaging Material and Technology, Hunan University of Technology, Zhuzhou 412007, China
| | - Weili Zhang
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
| | - Ruomei Wu
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
| | - Qiong Xue
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China; (W.Z.); (Z.L.); (G.W.); (W.W.); (H.Z.); (W.Z.); (R.W.); (Q.X.)
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