KR-20260065573-A - Lutetium-Carbon Composite And Piezoelectric Composite Material Comprising The Same

Abstract

The present invention relates to a lutetium-carbon composite that can be used as a filler for a piezoelectric composite material, and a piezoelectric composite material containing the same.

Inventors

• 주상우
• 타파스만달
• 나르기쉬파빈

Assignees

• 영남대학교 산학협력단

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241101

Claims (11)

1. A lutetium-carbon composite characterized by lutetium (Lu) being chemically bonded to the surface of carbon microspheres doped with a heterogeneous element.
2. In paragraph 1, The above heterogeneous element is a lutetium-carbon complex in which nitrogen (N), sulfur (S), or nitrogen and sulfur.
3. In paragraph 1, A lutetium-carbon complex in which the lutetium forms a lutetium-oxygen-carbon (Lu-OC) bond by bonding with a carboxyl group (-COOH) or a hydroxyl group (-OH) present on the surface of the carbon microsphere.
4. In paragraph 1, A lutetium-carbon composite having an average particle size of 100 nm to 10 μm of the carbon microspheres.
5. A piezoelectric composite material comprising a filler comprising a lutetium-carbon composite according to any one of claims 1 to 4 and a polymer matrix.
6. In paragraph 5, A piezoelectric composite material in which the polymer matrix is a silicone rubber matrix.
7. In paragraph 5, A piezoelectric composite material having a content of 0.1 to 10 parts by weight of the filler per 100 parts by weight of the polymer matrix.
8. In paragraph 5, The above filler is a piezoelectric composite material further comprising layered MoS₂ nanosheets.
9. A piezoelectric element comprising: a first electrode layer, a second electrode layer, and a piezoelectric layer comprising a piezoelectric composite material according to claim 5.
10. A method for manufacturing a lutetium-carbon composite according to any one of claims 1 to 4, Step of synthesizing carbon microspheres; and A manufacturing method comprising the step of adding a precursor solution containing lutetium and a heterogeneous element source to a solution in which the carbon microspheres are dispersed and reacting it.
11. In Paragraph 10, The above heterogeneous element is nitrogen, and A method of preparation in which the above precursor solution comprises lutetium nitrate and thiourea.

Description

Lutetium-Carbon Composite and Piezoelectric Composite Material Comprising The Same The present invention relates to a lutetium-carbon composite and a method for manufacturing the same, a piezoelectric composite material comprising a lutetium-carbon composite, and a piezoelectric element. Recently, there has been a growing interest in the development of wearable electronic devices, portable power devices, and self-powered electronic devices. Wearable electronic devices are generally designed to be worn on the body or integrated into textiles. These wearable electronic devices often use flexible electroactive elastomers as substrates, and recently, silicone rubber (SR), which can be provided in transparent or colored forms, is frequently used as a substrate for wearable electronic devices. Energy generation methods for wearable electronic devices are classified into piezoelectric, triboelectric, or electromagnetic induction. Among these, the method utilizing the piezoelectric effect is considered the most promising due to its simple structure, which is advantageous for miniaturization and flexible design, and its ability to achieve high power density. Piezoelectric devices consist of a piezoelectric material and a pair of electrodes as basic components. The piezoelectric material is typically composed of fillers such as natural minerals that produce the piezoelectric effect, barium titanate, carbon black, CNTs, and graphene dispersed in a polymer matrix. Meanwhile, research on energy harvesting materials capable of achieving a balance of excellent elasticity, mechanical durability, short response time, and high output voltage has not yet been sufficiently conducted, and further development in this area is necessary. Figure 1 shows the elemental distribution images (g) obtained by SEM (ac), TEM (df), and HAADF-STEM for the nitrogen-doped lutetium-carbon microspheres (N, Lu-CMS) of Preparation Example 1. Figure 2 shows the elemental distribution images (g) obtained by SEM (ac), TEM (df), and HAADF-STEM for nitrogen and sulfur-doped lutetium-carbon microspheres (N, S, Lu-CMS) of Preparation Example 2. Figure 3 shows the XPS analysis results for N, S, and Lu-CMS of Preparation Example 2. FIG. 4 shows the XRD spectrum (a) and Raman spectrum (b) for the composite material of Example 1 (N, Lu-CMS + SR), the composite material of Comparative Example 2 ( MoS2 + SR), and the composite material of Example 4 (N, Lu-CMS + MoS2 + SR), silicone rubber (SR), commercial molybdenum disulfide ( MoS2 ) nanosheet powder, N, Lu-CMS of Preparation Example 1, and lutetium nitrate. Figure 5 shows the XPS spectrum (a) and FTIR spectrum (b) for the composite material of Example 1 (N, Lu-CMS + SR), the composite material of Comparative Example 2 ( MoS₂ + SR), and the composite material of Example 4 (N, Lu-CMS + MoS₂ + SR), silicone rubber (SR), commercial molybdenum disulfide ( MoS₂ ) nanosheet powder, N, Lu-CMS of Preparation Example 1, and pure carbon microspheres (CMS). Figure 6 is an SEM image of the cross-sections of a pure silicone rubber sample (SR), the composite material of Example 1 (N, Lu-CMS + SR), the composite material of Comparative Example 2 ( MoS2 + SR), and the composite material of Example 4 (Hybrid). Figure 7 shows the results of the compression mechanical properties test for the piezoelectric composite materials of the examples and comparative examples. Figure 8 shows the tensile mechanical property test results for the piezoelectric composite materials of the examples and comparative examples. Figure 9 shows the fracture strain measured for the piezoelectric composite materials of the examples and comparative examples. Figure 10 is a schematic diagram of a piezoelectric element assembled to measure the electromechanical properties of a piezoelectric composite material in Experimental Example 2. Figure 11 shows the electromechanical behavior of a piezoelectric element including the composite material of Example 3. FIG. 12 shows the electromechanical behavior of a piezoelectric element containing the composite material of Comparative Example 4. FIG. 13 shows the electromechanical behavior of a piezoelectric element containing the composite material of Example 6. Figure 15 shows the results of XRD analysis performed on the composite materials of Example 3 and Example 6 before and after the electromechanical property test. FIG. 16 shows the voltage output from biomechanical energy pressed with a thumb or index finger for a piezoelectric element comprising the composite materials of Example 3, Comparative Example 4, and Example 6. Throughout this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Throughout this specification, when a component is described as being located "on" another component, this includes not only cases where a component is in contact with anot