Bi 4 − x La Ti 3 O 12 (La-doped BIT, x=0–0.6) thin films prepared by metalorganic decomposition method, were studied using x-ray diffraction (XRD), polarization hysteresis and Raman scattering techniques. The XRD studies showed that substitution reduces structural distortion, relaxes internal strain enhances polarization, while the data indicate added occupies mainly at A sites in BIT films. modes also an increase TiO6 symmetry, relaxation, lower Ti–O hybridization, decrease along a axis....

In recent years, the development of surface-enhanced Raman spectroscopy (SERS) substrates has seen significant advancement. this research, we successfully fabricated cotton swab-based SERS using a facile solution-based method. Our showed not only ultrasensitive detection capability but also impressive long-term stability and multiple recyclability rounds. particular, reported limit 10–12 M RhB detectable concentration thiophanate methyl as low 10-10 our substrates. The reached 12-month mark,...

Mở đầu: Thoát vị rốn được định nghĩa là thoát thành bụng ở hoặc gần rốn. Theo Hội Châu Âu trí đường giữa từ 3 cm trên và dưới Tỉ lệ khoảng 2% dân số, tỉ này gia tăng bệnh nhân xơ gan, béo phì. 20% gan có biểu hiện Bệnh kèm cảnh nhiều rối loạn toàn thân nên việc điều trị gặp thách thức. Việc cổ trướng vẫn còn tranh luận nhưng phương pháp phẫu thuật phục hồi sớm, tránh khi triệu chứng biến chấp nhận hơn. Kỹ bằng khâu cân đơn thuần đặt mảnh ghép tạo tiếp cận theo hướng nội soi mổ mở. Tuy nhiên,...

Our Raman study of 0–6mol% Bi excess Bi4Ti3O12 (BIT) films implies that symmetry breaking effect occurs in 0mol% film, which is restored to BIT 2–6mol% films. The “rigid layer” mode at 59.22cm−1 a higher stability the Bi2O2 layer than perovskite and has high preference incorporate into layer. Increasing incorporation A site enhances Jahn–Teller distortion TiO6 octahedra c orientation. This doping by an ion without outer orbital like La can decrease distortion, change orientation, tilt...

Graphene quantum dots (GQDs) have garnered immense interest in recent years due to their unique optical, electrical, and chemical properties, making them promising candidates for various applications optoelectronics, bioimaging, sensing. However, enhancing the control over size, surface chemistry, optical properties of GQDs remains a significant challenge. In this study, novel recipe was proposed successfully synthesize via typical solvothermal process, which has proven be versatile scalable...

In this research, few–layer–graphene (FLG) sheets had been successfully fabricated by using a microwave–assisted method. First, graphite intercalation compounds were prepared from potassium–tetrahydrofuran (K–THF) –expanded solvothermal process, and then the exfoliation was assisted microwave radiation sonication process. The resulted nano–graphene has average thickness about ~ 2 nm with lateral size of 3–7 μm. Raman analysis showed that as–synthesized graphene nanosheets contain only few...

Unlike the crisis in U.S which mainly started from secondary investors and financial system, Vietnam's housing bubble is caused by primary realty investors. When businesses Vietnam made lower profits, this led a rush to investments real estate market even those who are newly established, lack of professionalism development knowledge urban economics. Many their projects were feasibility as products could not be sold or developed, leaving frozen with huge numbers empty plots, houses,...

Vertically well–aligned ZnO nanowire (NW) arrays with high density were directly synthesized on graphene/Si substrate by thermal evaporation of zinc powder without catalysts or additives. The NWs characterized field emission scanning electron microscopy (FE–SEM), resolution transmission (HRTEM), X–ray diffraction (XRD), photoluminescence (PL), and Raman spectroscopy. results showed that the obtained have diameters in range 300–350 nm lengths several tens micrometers. prepared are a single...