一维有机-无机杂化复合物的高压电、介电弛豫和半导体特性：[2-甲基-1,5-戊二胺][BiCl5],Journal of Materials Chemistry C

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一维有机-无机杂化复合物的高压电、介电弛豫和半导体特性：[2-甲基-1,5-戊二胺][BiCl5]
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2023-09-30 , DOI: 10.1039/d3tc02873a
Zheng-Hui Hu ₁ , Xin-Yu Liu ₁ , Shu-Qi Sun ₁ , Chen Gong ₁ , Nuo Liu ₁ , Ji-Xing Gao ₁

Affiliation

分子相变材料是一类特殊的多功能分子材料，可以具有铁电、热释电、介电、压电、非线性和半导体等特性；特别是同时含有有机和无机材料的有机-无机杂化配合物受到了广泛关注。近十年来，虽然取得了很多突破，但关键参数仍需进一步探索。在这项工作中，我们合成了一组具有介电弛豫的有机-无机杂化多功能材料，[2-MPDA][BiX ₅ ]（2-MPDA = 2-甲基-1,5-戊二胺，X = Cl，Br， I)，并对变温结构、DSC(差示扫描量热法)、变温电介质、SHG(二次谐波产生)、紫外吸收和压电性能进行了测量和分析。结果表明，[2-MPDA][BiCl ₅ ] ( 1 )在166 K附近发生可逆结构相变，[2-MPDA][BiBr ₅ ] ( 2 )和[2-MPDA][空间群BiI ₅ ]( 3 )为Pnma。在460 nm、490 nm和660 nm处的带隙分别为3.02 eV、2.63 eV和1.93 eV。化合物1沿c轴的压电系数d ₃₃ = 6 pC N ^-1与KTP ( b -aixs)相同，优于ZnO ( c -aixs)、克罗康酸( c - aixs）和 Nylon-11（薄膜）。该工作为分子基无铅结构相变多功能材料的探索提供了新的思路和方法。

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High piezoelectric, dielectric relaxation and semiconductor properties in a one-dimensional organic–inorganic hybrid complex: [2-methyl-1,5-pentanediamine][BiCl5]

Molecular-based phase change materials are a kind of special multi-functional molecular material, which can possess ferroelectric, pyroelectric, dielectric, piezoelectric, nonlinear and semiconductor properties; in particular, organic–inorganic hybrid complexes, containing both organic and inorganic materials, have received much attention. In the past ten years, although a lot of breakthroughs have been made, the key parameters still need to be further explored. In this work, we have synthesized a group of organic–inorganic hybrid multifunctional materials with dielectric relaxation, [2-MPDA][BiX₅] (2-MPDA = 2-methyl-1,5-pentanediamine, X = Cl, Br, I), and the variable temperature structure, DSC (differential scanning calorimetry), variable temperature dielectric, SHG (second harmonic generation), ultraviolet absorption and piezoelectric properties were measured and analyzed. The results show that [2-MPDA][BiCl₅] (1) has a reversible structural phase transition near 166 K, and the space groups of [2-MPDA][BiBr₅] (2) and [2-MPDA][BiI₅] (3) are Pnma. The band gap is 3.02 eV, 2.63 eV and 1.93 eV at 460 nm, 490 nm and 660 nm, respectively. The piezoelectric coefficient d₃₃ = 6 pC N⁻¹ along the c-axis of compound 1 is the same as that of KTP (b-aixs), and is better than that of ZnO (c-aixs), croconic acid (c-aixs) and Nylon-11 (thin film). This work provides a new idea and method for the exploration of molecular-based lead-free structure phase change multifunctional materials.

更新日期：2023-09-30

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