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The Tuning of Optical Properties of Nanoscale MOFs-Based Thin Film through Post-Modification
Summary:
The authors from National University of Defense Technology developed (NH2)-MIL-53(Al) nanorod-based optical thin films with tunable optical properties, achieving regulated structural color, reflectance, and refractive index for optoelectronic applications.
Background:
1. Conventional inorganic optical films are hard to tailor optically; existing MOF film optical tuning via vapor adsorption lacks long-term stability, and direct synthesis of functional MOFs is limited.
2. The authors proposed a post-modification strategy using aldehydes with different carbon chains, realizing stable and controllable tuning of MOF film optical properties.
Research Content:
1. Synthesis: Hydrothermally synthesized (NH2)-MIL-53(Al) nanorods, fabricated thin films via spin-coating, and modified them with C3/C5/C7 aldehydes through post-modification.
2. Characterizations:
1) BET area: 560 m²/g, total pore volume: 0.54 cm³/g;
2) SEM/TEM showed nanorods (44.8±13.2 nm × 23.4±3.8 nm) and film thickness ~301.3±11.7 nm;
3) Optical tests: 750 nm refractive index tuned 1.292–1.424, reflection peak red-shifted to 498 nm.
3. Application: Potential for optoelectronic devices requiring customized optical properties.
4. Mechanism: Aldehydes reacted with MOF amino groups; carbon chain length affected modification degree due to pore size constraints, altering optical properties.
Outlook:
This research pioneers stable optical tuning of MOF films via post-modification, providing a new path for customizable optical materials in optoelectronics.
The Tuning of Optical Properties of Nanoscale MOFs-Based Thin Film through Post-Modification
Authors: Wenchang Yin, Cheng-an Tao, Xiaorong Zou, Fang Wang, Tianlian Qu, Jianfang Wang
DOI: 10.3390/nano7090242
Link: https://pubmed.ncbi.nlm.nih.gov/28850057
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