Graphene Oxide-Intercalated Tetrazole-Based Coordination Polymers: Thermally Stable Hybrid Energetic Crystals with Enhanced Photosensitivity

• Published in: Langmuir Vol. 39; no. 5; pp. 1957 - 1967
• Main Authors: Meng, Ke-Juan, Yang, Sulan, Yu, Minghui, Lu, Feipeng, He, Aifeng, Yan, Qi-Long
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 07.02.2023
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/acs.langmuir.2c03008

High-energy-density photosensitive pyrotechnics with good thermal stability have been in increasing demand in recent years. In this paper, graphene oxide (GO)-intercalated energetic coordination polymers (ECPs) are prepared with improved thermostability but great photosensitivity by using high nitrogen compounds azotetrazole (AT) and 5,5′-bistetrazole-1,1′-diolate dehydrate (BTO) as ligands. The decomposition activation energy (E a) of Cu-AT has been increased from 135.7 to 151.9 kJ·mol–1 after intercalating 5 wt% GO, and in the meantime, the exothermic peak temperature (T p) was increased by 12.6 °C. However, the decomposition E a of Cu-BTO decreased under the effect of the same amount of GO with little effect on T p. This confirms that GO has stabilization effects on the Cu-AT crystal, whereas the catalytic effects on Cu-BTO would dominate after dehydration with its crystal lattice collapse. Also, when the content of GO was 3%, the resultant GO0.03-Cu-AT exhibits a higher density (2.88 g·cm–3) and good thermostability (T p = 293.7 °C). This ECP shows excellent low-energy laser ignition performance, which can be ignited with an energy of less than 1 mJ at a wavelength of 976 nm. Low-energy laser initiation is considered to be a safer but more reliable method than the traditional electrical-based ones.