Publications by authors named "Zhennan Zhu"

Objective: To investigate the factors influencing hyperuricemia in children and adolescents and to provide a scientific basis for early prevention and treatment.

Methods: A retrospective study (2017-2021) of the prevalence of hyperuricemia in children and adolescents was conducted, and the factors influencing hyperuricemia were analyzed by multi-factor logistic regression.

Results: The overall prevalence of hyperuricemia in children and adolescents aged 6-17 years in northeast Sichuan Province was 55.

View Article and Find Full Text PDF

A printable, flexible display panel is an important trend in the field of information display, which requires better mechanical and electrical properties of device materials. Polymer-metal oxide composite materials are promising in the functional layer of a thin-film transistor (TFT) and can be sufficiently fabricated by polymer-metal salt solution systems through the sol-gel process. For the development of polymer-metal oxide composite ink, it is necessary to study the film-forming mechanism of the composite film during solidification, which is an important reference in ink component design.

View Article and Find Full Text PDF

Polymer/oxide hybrid thin films, which have excellent electrical and mechanical performance, can be effectively fabricated through the sol-gel process, showing great potential in the future printed electronics. However, gelation of polymer/oxide ink systems can easily occur during a thermal process in which case capillary stress can lead to the crack of printed films due to the long period of stress accumulation. To solve this problem, the effect of different solvent systems on formed PAM/ZrO hybrid films, which were printed by piezoelectric printing, was studied in this paper, including single solvent systems of glycol and binary solvent systems of glycol and water.

View Article and Find Full Text PDF

Type 1 diabetes arises from the autoimmune destruction of insulin-producing beta-cells of the pancreas, resulting in dependence on exogenously administered insulin to maintain glucose homeostasis. In this study, our aim was to identify genetic risk factors that contribute to progression from islet autoimmunity to clinical type 1 diabetes. We analyzed 6.

View Article and Find Full Text PDF

Drop-on-demand printing is a noncontact direct patterning and rapid manufacturing printing technology which shows considerable potential in future display manufacturing. Metal oxides are an important kind of functional material in thin-film transistors, which are the core component of active matrix display technology, and thus printing a high-quality metal oxide functional layer is of great importance. In this feature article, we focused on the current progress in one of the foundations of drop-on-demand printing technology-the ink system.

View Article and Find Full Text PDF

In this paper, a solution-processed zirconium oxide (ZrO) dielectric was deposited by spin coating with varying pre-annealing temperatures and post-annealing temperatures. The thermal effect of the pre-annealing and post-annealing process on the structural and electrical properties of ZrO films was investigated. The result shows that the pre-annealing process had a significant impact on the relative porosity and internal stress of ZrO film.

View Article and Find Full Text PDF

A polymer-doped ink system was applied to a printed InO thin film transistor (TFT), and enhancement mode devices were obtained with an appropriate polymer doping amount. As the polymer doping concentration (PDC) increases, the threshold voltage of thin film transistor shifts positively, while the mobility and subthreshold slope show only an insignificant degradation. The microanalysis shows that the polymer doping can generate traps and defects in the oxide lattice, thus shifting the threshold voltage positively and degrading the mobility and subthreshold slope.

View Article and Find Full Text PDF

In this work, a low leakage current ZrO was fabricated for sputter indium gallium zinc oxide (IGZO) thin-film transistor using direct inkjet-printing technology. Spin-coated and direct inkjet-printed ZrO were prepared to investigate the film formation process and electrical performance for different process. Homogeneous ZrO films were observed through the high-resolution TEM images.

View Article and Find Full Text PDF

Objective: Genetic risk scores (GRS) have been developed that differentiate individuals with type 1 diabetes from those with other forms of diabetes and are starting to be used for population screening; however, most studies were conducted in European-ancestry populations. This study identifies novel genetic variants associated with type 1 diabetes risk in African-ancestry participants and develops an African-specific GRS.

Research Design And Methods: We generated single nucleotide polymorphism (SNP) data with the ImmunoChip on 1,021 African-ancestry participants with type 1 diabetes and 2,928 control participants.

View Article and Find Full Text PDF

We have successfully developed an ink system containing inexpensive raw materials through a simple process and have printed ZrO dielectric film at a relatively low annealing temperature of 250 °C. The ZrO dielectric film afforded a leakage current density of 5.4 × 10 A/cm at 1 MV/cm and a dielectric constant of 10 and shows a promising future for flexible electronics.

View Article and Find Full Text PDF
Article Synopsis
  • Many existing methods to improve the uniformity of inkjet-printed structures focus on controlling capillary flow during solvent evaporation, but these methods often vary based on the ink system used.
  • A new approach presented in this paper involves using a sol-gel ink system that combines a polymer (polyacrylamide) and a surfactant (FSO) to gel the ink, preventing capillary flow before evaporation.
  • The resulting zirconium oxide (ZrO) film demonstrates a uniform structure and impressive electrical properties, achieving a leakage current density of 7.48 × 10 A/cm² at 1 MV and a breakdown field strength of 1.9 MV/cm after being annealed at 250 °C
View Article and Find Full Text PDF

In this paper, an alumina-zirconia (Al₂O₃-ZrO₂) nanolaminate dielectric was fabricated by spin-coating and the performance was investigated. It was found that the properties of the dielectric can be adjusted by changing the content of Al₂O₃/ZrO₂ in nanolaminates: when the content of Al₂O₃ was higher than 50%, the properties of nanolaminates, such as the optical energy gap, dielectric strength (V), capacitance density, and relative permittivity were relatively stable, while the change of these properties became larger when the content of Al₂O₃ was less than 50%. With the content of ZrO₂ varying from 50% to 100%, the variation of these properties was up to 0.

View Article and Find Full Text PDF

Inkjet-printed silver gate electrode with low electrical resistivity was fabricated by UV curing method. By adjusting the UV curing time and the distance between the samples and UV lamp, the effects of UV curing conditions on the electrical resistivity of the silver films were studied, and the lowest electrical resistivity of 6.69 × 10 Ω·m was obtained.

View Article and Find Full Text PDF

Solution-processed high-k dielectric TFTs attract much attention since they cost relatively little and have a simple fabrication process. However, it is still a challenge to reduce the leakage of the current density of solution-processed dielectric TFTs. Here, a simple solution method is presented towards enhanced performance of ZrO₂ films by intentionally increasing the concentration of precursor.

View Article and Find Full Text PDF

Printing technologies for thin-film transistors (TFTs) have recently attracted much interest owing to their eco-friendliness, direct patterning, low cost, and roll-to-roll manufacturing processes. Lower production costs could result if electrodes fabricated by vacuum processes could be replaced by inkjet printing. However, poor interfacial contacts and/or serious diffusion between the active layer and the silver electrodes are still problematic for achieving amorphous indium-gallium-zinc-oxide (a-IGZO) TFTs with good electrical performance.

View Article and Find Full Text PDF

The control of channel length is of great significance in the fabrication of thin film transistors (TFTs) with high-speed operation. However, achieving short channel on untreated glass by traditional piezoelectric inkjet printing is problematic due to the impacting and rebounding behaviors of droplet impinging on solid surface. Here a novel method was proposed to obtain short channel length on untreated glass by taking advantage of the difference in the retraction velocities on both sides of an ink droplet.

View Article and Find Full Text PDF

Bombyx mori nucleopolyhedrovirus (BmNPV) bm47 gene is found in all sequenced lepidopteran nucleopolyhedroviruses (NPVs). It is one of the core genes of NPVs. However, the role of bm47 in the biological cycle of NPV remains unknown.

View Article and Find Full Text PDF