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Hari Sutrisno
Universitas Negeri Yogyakarta
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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ANALISIS PERHITUNGAN AWAL STRUKTUR ELEKTRONIK DAN MIKROSTRUKTUR TiO2 ANATAS TERDADAH ION Cr3+ Puspitasari, Adinda Putri; Sutrisno, Hari
Jurnal Elemen Kimia Vol 10, No 1 (2026): Jurnal Elemen Kimia
Publisher : Universitas Negeri Yogyakarta

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Abstract

Titanium dioksida seringkali digunakan sebagai bahan fotokatalis namun masih memiliki kelemahan karena memiliki energi celah pita yang besar sehingga perlu dilakukan modifikasi untuk menurunkannya. Penelitian ini bertujuan untuk menentukan pengaruh variasi kuantitas ion sebagai pendadah  anatas terhadap mikrostruktur dan struktur elektronik. Metode yang digunakan adalah pendekatan density functional theory (DFT) dengan korelasi perubahan Generalizated Gradien Approximation+Perdew-Burke-Ernzerhof fos Solid (GGA+PBESol) yang dilakukan menggunakan aplikasi BIOVIA Material Studio 2017 subprogram CASTEP. Variasi kuantitas ion Cr3+ yang digunakan adalah 0; 2; 4,5; 7; 9,5; 12; 14,5; 17; 19,5; 22; dan 24,5%. Hasil perhitungan mikrostruktur TiO2 dengan berbagai variasi kuantitas pendadah ion Cr3+ tidak mengalami perubahan struktur, namun penambahan doping mengakibatkan kecenderungan penurunan volume dan parameter kisi dengan struktur anatas space group /amd. Nilai struktur elektronik dari TiO2 anatas terdadah ion Cr3+ menghasilkan penurunan energi celah pita dari pita konduksi ke pita valensi dengan nilai energi celah pita 3,2 sampai 2,995 eV. Struktur DOS mengalami pergeseran dari pita konduksi ke pita valensi. Doping optimal berada pada 14,5%, secara keseluruhan  anatas yang didoping ion  menghasilkan celah pita tidak langsung (indirect gap) yang bersifat semikonduktor.Kata Kunci: DFT; Kromium; Mikrostruktur; Struktur elektronik; TiO2 Anatas
PENGARUH VARIASI MOL AWAL ATOM NITROGEN ( N ) TERHADAP KRISTALINITAS, UKURAN PARTIKEL, KARAKTER MIKROSTRUKTUR, DAN SIFAT OPTIK PADA ZnO(1-x)Nx Putri Chrisberta, Maria Luisella Anadya; Sutrisno, Hari
Jurnal Elemen Kimia Vol 10, No 1 (2026): Jurnal Elemen Kimia
Publisher : Universitas Negeri Yogyakarta

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh variasi konsentrasi awal mol atom nitrogen terhadap  (1) kristalinitas, ukuran partikel, (2) karakteristik mikrostruktur, dan (3) sifat optik (band gap) ZnO(1-x)Nx. yang disintesis dengan metode hidrotermal.Sintesis ZnO(1-x)Nx dilakukan dengan menggunakan prekursor Zn yaitu seng asetat dihidrat dan urea untuk prekursor nitrogen. Variasi konsentrasi mol awal nitrogen dilakukan dengan nilai x= 0; 0,05; 0,08; 0,1; 0,15 dengan proses hidrotermal yang dilakukan pada suhu 150℃ selama 6 jam,  diikuti oleh kalsinasi pada temperatur 400℃ dengan waktu 1 jam. Selanjutnya, pengaruh variasi konsentrasi mol awal nitrogen dipelajari dengan  mengamati kristalinitas, ukuran partikel, karakter mikrostruktur dan sifat optik menggunakan instrumen X-ray Diffraction (XRD) dan UV-Vis Diffuse  Reflectance Spectroscopy (UV-Vis DRS).Hasil penelitian ini menunjukkan: (1) seluruh sampel ZnO(1-x)Nx memiliki fasa wurtzite, sistem kristal hexagonal dengan grup ruang P63mc. Grafik tren kristalinitas naik dan grafik ukuran partikel turun lalu naik kembali seiring bertambahnya mol nitrogen. Sampel optimal pada ZnO 0,1 dengan nilai % kritalinitas sebesar 89,2% dan ukuran partikel sebesar 28,02 nm, (2) penambahan konsentrasi mol nitrogen terbukti terpengaruh terhadap karakter mikrostruktur. Variasi optimal pada sampel ZnO 0,1, dengan nilai a=b= 3,251 Å  c= 5,2072 Å, volume sel sebesar 47,66 Å3, dan panjang ikatan Zn – O ax. 1.9791 Å dan eq. 1.9772 Å, (3) semua sampel memiliki jenis transisi energi celah pita langsung (direct) dimana semakin tinggi konsentrasi awal mol nitrogen yang ditambahkan menyebabkan naiknya pita valensi sehingga energi celah pita semakin kecil, variasi optimal pada sampel ZnO 0,1 (x= 0,1) dengan energi celah pita sebesar 3,17 eV dan panjang gelomang sebesar 390,31 nm. Sehingga terbukti penambahan konsentrasi mol nitrogen dapat mempengaruhi sifat optik ZnO(1-x)Nx.Kata kunci: Hidrotermal, doping, mikrostruktur, sifat optik, ZnO
Chemistry Teachers’ Self-efficacy for Using Information and Communication Technology: A Survey Cross Sectional Insani Efrili Yanti; Hari Sutrisno
Jurnal Penelitian Pendidikan IPA Vol 10 No 9 (2024): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i9.7419

Abstract

The utilization of ICT in education could be further optimized due to the low self-efficacy of teachers. Teachers' years of teaching experience and the status of their schools have an influence on their ICT self-efficacy. This study aims to describe the differences in ICT self-efficacy among chemistry teachers based on their teaching experience and school status. This study used a quantitative approach with a cross-sectional survey method. The research was conducted in 31 high schools in Pekanbaru City and included a randomly selected sample of 50 chemistry teachers. The research instruments consisted of ICT self-efficacy questionnaires 14 items. ICT self-efficacy instrument declared valid and reliable using the Rasch model test. Additionally, interview data were employed to reinforce the findings from the questionnaire. The research questionnaire data underwent processing using analysis descriptive statistics and a two-way ANOVA test with SPSS. The results of the research show that there is a significant difference in the ICT self-efficacy of chemistry teachers based on the teacher's teaching experience with significance level of 0.005 and there is no difference the ICT self-efficacy of chemistry teachers based on school status with significance level of 0.783. The effect size test shows that the partial eta square value for the effect of teaching experience belongs to the high category while school status belongs to the low category.
IMPLEMENTATION OF LEARNING MODELS PBL- REDIPPER FOR INCREASE ABILITY THINK CRITICAL AND COLLABORATION STUDENTS ON ATOMIC STRUCTURE MATERIAL Pravita Saktiyani; Hari Sutrisno
International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) Vol. 5 No. 7 (2026): JUNE
Publisher : RADJA PUBLIKA

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Abstract

Study This aim For analyze influence application of learning models Problem-Based Learning integrated REDIPPER (PBL-REDIPPER) against ability think critical (KBK) and ability collaboration (KOL) participants educate on the material atomic structure . Type of research used is experiment quasi - experimental with​ design pretest-posttest control group design . Subject study involving 72 participants educate class XI in one of the senior high schools in Cirebon Regency which is divided into to in two groups , namely class experiments (n = 36) with the PBL-REDIPPER model and class control (n = 36) with the Direct Instruction (DI) model . Research data collected use instrument test essay ability think critical and sheet observation skills collaboration that has been validated . Data analysis techniques using analysis Multivariate Analysis of Variance (MANOVA) assisted by IBM SPSS Statistics 26. Analysis results statistics multivariate show that the PBL-REDIPPER model provides influence very significant simultaneity to ability think critical and collaborative participant educate in a way simultaneously (p = 0.007 < 0.01$) with contribution practical as big as 13.4% of which is included in category effect moderate . Univariate test results partial also confirms significant differences in each variable bound , where the learning model give contribution effect as big as 13.1% ( category currently ) to variation ability think critical (p = 0.002), and as big as 11.5% ( category currently ) to variation ability collaboration participant educated (p = 0.004). With Thus , the implementation PBL-REDIPPER syntax is proven effective in facilitate reconstruction draft abstract chemistry at a time optimize competence sociocognitive 21st century participants educate .
Electronic Structure of Vanadium-Doped TiO2 of Both Anatase and Rutile Based on Density Functional Theory (DFT) Approach Sutrisno, Hari
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.11374.60-71

Abstract

Study of the theoretical  approah to calculate the band structure and density of states (DOS) of vanadium-doped TiO2 of both anatase and rutile have been done. The first-principle calculations were done using supercell (2x1x1) method. The first-principle calculation of V-doped TiO2 of both anatase and rutile were analyzed by density-functional theory (DFT) with generalized gradient approximation from Perdew-Burke-Ernzerhof (GGA+PBE), Perdew-Wang’s 1991 (GGA+PW91) and local density approximation (LDA) for exchange-correlation functionals. The calculation of electronic structures show that the V-doped TiO2-anatase with high concentration (7.93%) in 24 atoms are direct- and indirect-gap semiconductor, whereas the V-doped TiO2-rutile with high concentration (15.79%) in 12 atoms is direct-gap semiconductor. The V-doped TiO2 of both anatase and rutile produce the intermediate bands in the upper states. Ihe V-doped anatase produces intermediate band, which is 2.05, 2.04, 2.06 eV above the valence band for GGA+PBE, GGA+PW91 and LDA, respectively. Meanwhile the V-doped rutile producesintermediate band, which is 1.76, 1.82, 1.74 eV above the valence band for GGA+PBE, GGA+PW91 and LDA, respectively.
Modifikasi Sifat Elektronik Material Perovskit NaYTiO4 oleh Variasi Konsentrasi Dopan Lantanum dengan Metode Density Functional Theory Wisanggeni Bayu Aji; Hari Sutrisno
ALCHEMY Jurnal Penelitian Kimia Vol 18, No 1 (2022): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.18.1.53333.80-94

Abstract

Energi celah pita dan density of state (DOS) dari NaY(1-x)LaxTiO4 (x = 0; 0,25; 0,50 dan 0,75) dapat diprediksi secara teoritis menggunakan pendekatan density functional theory (DFT). Perhitungan awal berdasarkan atas pendekatan local density approximation (LDA) dan generalized gradient approximation dari Perdew-Burke-Ernzerhof (GGA+PBE) sebagai fungsional tukar-korelasi. Perhitungan awal energi celah pita dan DOS dilakukan pada unit sel konvensional (1×1×1) untuk NaYTiO4 dan supersel (2×2×1) untuk NaY(1-x)LaxTiO4 (x = 0,25; 0,50 dan 0,75) dengan program CASTEP Materials Studio. Hasil perhitungan menunjukkan energi celah pita (Eg) sebesar 3,447; 3,384; 3,356 dan 3,560 eV untuk x = 0; 0,25; 0,50 dan 0,75 dengan metode LDA. Di sisi lain, metode GGA+PBE menunjukkan Eg sebesar 3,039; 2,963 dan 2,930 eV untuk x = 0; 0,25; 0,50 dan 0,75. Hasil perhitungan karakter DOS menunjukkan bahwa seluruh material menunjukkan transisi Eg tersebut dikontribusi oleh transisi elektron antara pita valensi O 2p dan konduksi Ti 3d. Susbtitusi atom La pada posisi atom Y tidak menghasilkan pita di tengah Eg (intermediate band) melainkan hanya memperlebar atau mempersempit celah pita pada NaY(1-x)LaxTiO4 akibat distorsi panjang ikatan Ti‒O. Penelitian ini menunjukkan peran signifikan dari La terhadap sifat elektronik material NaY(1-x)LaxTiO4 untuk aplikasi pada sel surya di masa depan. Modification of Electronic Properties of NaYTiO4 Perovskite Material by Variation of Lanthanum Dopants Concentration using Density Functional Theory Method. Bandgap energy and density of state (DOS) of NaY(1-x)LaxTiO4 (x = 0; 0.25; 0.50 and 0.75) can be predicted theoretically using density functional theory (DFT) approach. The initial calculation is based on the local density approximation (LDA) and generalized gradient approximation of Perdew-Burke-Ernzerhof (GGA+PBE) as exchange-correlation functional. Initial calculations of bandgap energy and DOS were performed on conventional unit cells (1×1×1) for NaYTiO4 and supercells (2×2×1) for NaY(1-x)LaxTiO4 (x = 0.25; 0.50 and 0.75) with the CASTEP Materials Studio program. The calculation results show the bandgap energy (Eg) of 3.447; 3.384; 3.356 and 3.560 eV for x = 0; 0.25; 0.50 and 0.75 with the LDA method. On the other hand, the GGA+PBE method shows an Eg of 3.039; 2.963 and 2.930 eV for x = 0; 0.25; 0.50 and 0.75. DOS character calculation results show that all materials exhibit the Eg transition, which is contributed by the electron transition between the O 2p valence band and Ti 3d conduction band. The substitution of La atoms at the Y atomic position does not produce a band in the middle of Eg (intermediate band) but only widens or narrows the bandgap in NaY(1-x)LaxTiO4 due to distortion of the Ti‒O bond length. This study demonstrates the significant role of La on the electronic properties of NaY(1-x)LaxTiO4 materials for future solar cell applications.
Co-Authors . DARMAWAN . Ismail . SUPUTA Abukasim, Sudarto Abukasim, Sudarto M. Achmad Saiful Whatoni Ajeng Widya Indriana Al Ansary, Ahmad Luthfi Alita, Alita Alusti Cundo Manik Amirah, Giska Anik Nur Laili Antonia Fransiska Laka Ariswan Ariswan Ariswan, Ariswam Aurelia Revi Pusbelina Balke, Michael Bruno Cancian de Araujo Cahyorini Kusumawardani Chrisoph Hauser CIPTO WALUYO Dahlan, Jafar Das Salirawati de Araujo, Bruno Cancian Desfi Annisa Desfi Annisa Desfi Annisa, Desfi Djunijanti Peggie Djunijanti Peggie, Djunijanti Dwi Anggi Marini Eddy Nurtjahya Eko Wahyu Budi Darmawan Eli Rohaeti Endang Dwi Siswani Endang Dwi Siswani Endang Widjajanti Laksono FX Fajar Naqsyahbandi Hagus Tarno Hari Purnomo Hauser, Chrisoph I WAYAN SUANA Ifan Rivaldo Iman hidayat Insani Efrili Yanti Isnaya Khamida Zulfah Jajang Muhariyansah Kristian Handoyo Sugiyarto Kristina von Rintelen Kun Sri Budiasih Lutfi Afifah, Lutfi Luthfiah, Siska M.Sulthon Nur Harman Syah Putra Maesaroh Maesaroh Maesaroh Maesaroh Maesaroh Maesaroh Maria Tensiana Tima Michael Balke Muhamad Rom Ali Fikri Mursyidin, Abdul Halim Narakusumo, Raden Pramesa Nasihah, Durrotun Nensi Ulfatun Khasanan NUNUK WIDYASTUTI Nur Kholifah, Dwi Pravita Saktiyani Purwaningsih , Dyah Puspitasari, Adinda Putri Putri Chrisberta, Maria Luisella Anadya Raden Pramesa Narakusumo Rais Assad Faiz Ramadhan, Muhammad Hafizh Ratna Novita Sari Retno Arianingrum Rizqiyah, Fatihatur ROSICHON UBAIDILLAH Sandra Desfa Jayanti Satriyo Restu Adhi Schmidt, Stefan Setiawan, Muhamad Reza SISWO POLANDONO Sri Novita Yanda Stefan Schmidt Suasti Ayu Triwijiastuti Sudarsono Suharto . Suharto Suharto Sunarto Sunarto Sunarto Sunarto Susila Kristianingrum Thomas von Rintelen Toto Himawan Vina Ayu Mu&#039;izayanti von Rintelen, Kristina von Rintelen, Thomas wan zahara zaitu hania Wipsar Sunu Brams Dwandaru Wisanggeni Bayu Aji Yanda, Sri Novita