SINTESIS NANOKOMPOSIT Ag-SrTiO3 DENGAN METODE HIDROTERMAL MENGGUNAKAN EKSTRAK DAUN GAMBIR (Uncaria gambir Roxb) SEBAGAI BIOREDUKTOR DAN SIFAT HANTARAN LISTRIKNYA

SARAH, SALSABILAH (2025) SINTESIS NANOKOMPOSIT Ag-SrTiO3 DENGAN METODE HIDROTERMAL MENGGUNAKAN EKSTRAK DAUN GAMBIR (Uncaria gambir Roxb) SEBAGAI BIOREDUKTOR DAN SIFAT HANTARAN LISTRIKNYA. S1 thesis, Universitas Andalas.

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Abstract

Innovation in producing electrical energy needs to be done in the midst of depleting conventional energy sources, one of which is thermoelectricity. Thermoelectric generators are composed of thermoelectric materials that are usually made of metal oxides such as SrTiO3 (STO) which can conduct electricity because they are included in semiconductor materials. Ag-SrTiO3 has been synthesized with silver metal modification using hydrothermal method with the addition of gambir leaf extract as bioreductor and capping agent. XRD analysis showed Ag-SrTiO3 nanocomposite was formed upon the addition of silver metal and leaf extract with sample code PSTO-E3. FTIR analysis showed the interaction of capping agent and Tert-Butyl Amin (TBA) with SrTiO3 surface. This is shown at wave numbers 1588 cm-1 and 1122 cm-1 for TBA and 1466.32 cm-1 showing asymmetric C-H and 854 cm-1 for aromatic C-H from gambier leaf extract. Band gap measurements on STO and PSTO-E3 samples with UV-Vis DRS showed a decrease in band gap energy from 3.20 eV to 3.16 eV with the addition of silver and gambier leaf extract. The morphology of SrTiO3 and PSTO-E3 was also studied through High Resolution Transmission Electron Microscopy (HR-TEM) showing that the STO and PSTO-E3 samples have a non-uniform morphology. The crystal size after the addition of gambier leaf extract is smaller than pure SrTiO3. Electrical conductivity measurements showed that the electrical conductivity of the SrTiO3 sample was 1,86 × 10-6 S/cm while the PSTO-E3 sample gave an electrical conductivity of 124,4 × 10-6 S/cm, where the electrical conductivity value of the PSTO-E3 sample increased 67 times greater than the sample without silver. This shows that the synthesis of Ag-SrTiO3 with the addition of gambir leaf extract as a capping agent and bioreductor is able to form thermoelectric materials with better performance that can increase electrical conductivity

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