Nano Express最新文献_第10页

Effect of point defects and nanopores on the fracture behaviors in single-layer MoS2 nanosheets 点缺陷和纳米孔对单层二硫化钼纳米片断裂行为的影响

Nano Express Pub Date : 2021-11-03 DOI: 10.1088/2632-959X/ac3635

Hongwei Bao, Y. Miao, F. Ma

引用次数: 0

Near-infrared PbS quantum dots functionalized with affibodies and ZnPP for targeted imaging and therapeutic applications 用词缀和ZnPP功能化的近红外PbS量子点用于靶向成像和治疗应用

Nano Express Pub Date : 2021-10-27 DOI: 10.1088/2632-959X/ac33b8

Ali W. Al-Ani, F. Zamberlan, Lenny Ferreira, T. Bradshaw, N. R. Thomas, L. Turyanska

{"title":"Near-infrared PbS quantum dots functionalized with affibodies and ZnPP for targeted imaging and therapeutic applications","authors":"Ali W. Al-Ani, F. Zamberlan, Lenny Ferreira, T. Bradshaw, N. R. Thomas, L. Turyanska","doi":"10.1088/2632-959X/ac33b8","DOIUrl":"https://doi.org/10.1088/2632-959X/ac33b8","url":null,"abstract":"We report a new theranostic device based on lead sulfide quantum dots (PbS QDs) with optical emission in the near infrared wavelength range decorated with affibodies (small 6.5 kDa protein-based antibody replacements) specific to the cancer biomarker human epidermal growth factor receptor 2 (HER2), and zinc(II) protoporphyrin IX (ZnPP) to combine imaging, targeting and therapy within one nanostructure. Colloidal PbS QDs were synthesized in aqueous solution with a nanocrystal diameter of ∼5 nm and photoluminescence emission in the near infrared wavelength range. The ZHER2:432 affibody, mutated through the introduction of two cysteine residues at the C-terminus (Afb2C), was used as capping ligand to form Afb2C-PbS QDs that have a high binding affinity for HER2, which is overexpressed in several types of cancer including breast cancer. Afb2C-PbS QDs were further modified by conjugation with ZnPP, which acts as an anticancer agent. The biological activity of these QDs was tested against SKBR3 (HER2-positive) and MDA-MB-231 (HER2-normal) breast cancer cells, with results showing that ZnPP-Afb2C-functionalized PbS QDs were successfully targeted to the HER2-overexpressing cancer cells and induced cell apoptosis thanks to the conjugation with ZnPP. These results expand the use of the QD nanoplatform with the formulation of novel nanomaterials for targeted delivery and combined imaging and therapy via direct surface-protein interaction.","PeriodicalId":118165,"journal":{"name":"Nano Express","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127934994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Low-temperature synthesis of high-quality graphene by controlling the carbon-hydrogen ratio of the precursor 通过控制前驱体的碳氢比，低温合成高品质石墨烯

Nano Express Pub Date : 2021-10-26 DOI: 10.1088/2632-959X/ac3388

Jian-Zhi Huang, I‐Chih Ni, Yun-Hsuan Hsu, Shu-wei Li, Yu-Chen Chan, Shin-Yi Yang, Ming-Han Lee, S. Shue, Mei‐Hsin Chen, Chih‐I Wu

{"title":"Low-temperature synthesis of high-quality graphene by controlling the carbon-hydrogen ratio of the precursor","authors":"Jian-Zhi Huang, I‐Chih Ni, Yun-Hsuan Hsu, Shu-wei Li, Yu-Chen Chan, Shin-Yi Yang, Ming-Han Lee, S. Shue, Mei‐Hsin Chen, Chih‐I Wu","doi":"10.1088/2632-959X/ac3388","DOIUrl":"https://doi.org/10.1088/2632-959X/ac3388","url":null,"abstract":"A furnace-free inductively coupled plasma chemical vapor deposition (ICP-PECVD) system, which does not require sample heating, was used to grow graphene at a temperature below 300 °C. This studies have found that under low-temperature PECVD growth conditions, liquid precursors are more suitable for preparing low-temperature graphene precursors than gaseous precursors. Hence, benzene is used as a carbon precursor to obtain a sheet resistance of approximately 1.24 kΩ sq−1. In this research, it was discovered that the carbon-hydrogen ratio of the precursor molecule is an important factor while using PECVD to grow graphene. This factor affects the quality of graphene and the sheet resistance value —when the carbon–hydrogen ratio for the precursor molecule is 1:1, graphene has the high quality and lowest sheet resistance; when it is less than 1:2, the graphene that cannot be deposited has the worst quality and sheet resistance. Furthermore, we found that methane, a precursor often used to deposit graphene, will etch graphene under low-temperature conditions, and that acetylene can be used as a precursor to deposit graphene. It was further proven that the carbon–hydrogen ratio of the precursor molecules in the PECVD process caused the reduction in the graphene temperature.","PeriodicalId":118165,"journal":{"name":"Nano Express","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114563713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analytical application of H 2 O 2 -induced chiroptical graphitic carbon dots h2o2诱导热致石墨碳点的分析应用

Nano Express Pub Date : 2021-10-26 DOI: 10.1088/2632-959X/ac3389

Smita Das, Sudarshana Gogoi, N. Singh, P. Goswami

引用次数: 0

Fabrication of thermally conductive polymer composites based on hexagonal boron nitride: recent progresses and prospects 六方氮化硼导热聚合物复合材料的制备:最新进展与展望

Nano Express Pub Date : 2021-10-12 DOI: 10.1088/2632-959X/ac2f09

Yi Zhang, Haoting Niu, Wu Liyun, Nanyang Wang, Tao Xu, Zhe Zhou, Yujun Xie, Han Wang, Qian He, Kai Zhang, Yagang Yao

引用次数: 3

Direct fabrication and characterization of vertically stacked Graphene/h-BN/Graphene tunnel junctions 垂直堆叠石墨烯/h-BN/石墨烯隧道结的直接制备和表征

Nano Express Pub Date : 2021-10-11 DOI: 10.1088/2632-959X/ac2e9e

Ali S. Alzahrani, Adel Alruqi, B. Karki, Milinda Kalutara Koralalage, J. Jasinski, G. Sumanasekera

{"title":"Direct fabrication and characterization of vertically stacked Graphene/h-BN/Graphene tunnel junctions","authors":"Ali S. Alzahrani, Adel Alruqi, B. Karki, Milinda Kalutara Koralalage, J. Jasinski, G. Sumanasekera","doi":"10.1088/2632-959X/ac2e9e","DOIUrl":"https://doi.org/10.1088/2632-959X/ac2e9e","url":null,"abstract":"We have used a lithography free technique for the direct fabrication of vertically stacked two-dimensional (2D) material-based tunnel junctions and characterized by Raman, AFM, XPS. We fabricated Graphene/h-BN/Graphene devices by direct deposition of graphene (bottom layer), h-BN (insulating barrier) and graphene (top layer) sequentially using a plasma enhanced chemical vapor deposition on Si/SiO2 substrates. The thickness of the h-BN insulating layer was varied by tuning the plasma power and the deposition time. Samples were characterized by Raman, AFM, and XPS. The I-V data follows the barrier thickness dependent quantum tunneling behavior for equally doped graphene layers. The resonant tunneling behavior was observed at room temperature for oppositely doped graphene layers where hydrazine and ammonia were used for n-doping of one of the graphene layers. The resonance with negative differential conductance occurs when the band structures of the two electrodes are aligned. The doping effect of the resonant peak is observed for varying doping levels. The results are explained according to the Bardeen tunneling model.","PeriodicalId":118165,"journal":{"name":"Nano Express","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133692415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Naturally occurring protein nano compartments: basic structure, function, and genetic engineering 自然产生的蛋白质纳米室:基本结构、功能和基因工程

Nano Express Pub Date : 2021-10-04 DOI: 10.1088/2632-959X/ac2c93

Dimple Goel, Sharmistha Sinha

引用次数: 1

Estimation of the lifespan distribution of gold nanoparticles stabilized with lipoic acid by accelerated degradation tests and wiener process 硫辛酸稳定金纳米粒子寿命分布的加速降解试验和维纳法估计

Nano Express Pub Date : 2021-09-17 DOI: 10.1088/2632-959X/ac7c81

Betania Sánchez-Santamaría, B. Mederos, D. Cornejo-Monroy, R. D. Molina-Arredondo, V. Castaño

{"title":"Estimation of the lifespan distribution of gold nanoparticles stabilized with lipoic acid by accelerated degradation tests and wiener process","authors":"Betania Sánchez-Santamaría, B. Mederos, D. Cornejo-Monroy, R. D. Molina-Arredondo, V. Castaño","doi":"10.1088/2632-959X/ac7c81","DOIUrl":"https://doi.org/10.1088/2632-959X/ac7c81","url":null,"abstract":"Accelerated degradation tests (ADT) are widely used in the manufacturing industry to obtain information on the reliability of components and materials, by degrading the lifespan of the product by applying an acceleration factor that damage to the material. The main objective is to obtain fast information which is modeled to estimate the characteristics of the material life under normal conditions of use and to save time and expenses. The purpose of this work is to estimate the lifespan distribution of gold nanoparticles stabilized with lipoic acid (GNPs@LA) through accelerated degradation tests applying sodium chloride (NaCl) as an acceleration factor. For this, the synthesis of GNPs@LA was carried out, a constant stress ADT (CSADT) was applied, and the non-linear Wiener process was proposed with random effects, error measures, and different covariability for the adjustment of the degradation signals. The information obtained with the test and analysis allows us to obtain the life distribution in GNPs@LA, the results make it possible to determine the guaranteed time for possible commercialization and successful application based on the stability of the material. In addition, for the evaluation and selection of the model, the Akaike and Bootstrapping criteria were used.","PeriodicalId":118165,"journal":{"name":"Nano Express","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131948516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-catalyzed nanoscale ammonium perchlorate for advanced composite solid rocket propellant 先进复合固体火箭推进剂用自催化纳米级高氯酸铵

Nano Express Pub Date : 2021-09-01 DOI: 10.1088/2632-959X/ac2568

M. Abdelhafiz, M. Yehia, H. Mostafa, T. Wafy

{"title":"Self-catalyzed nanoscale ammonium perchlorate for advanced composite solid rocket propellant","authors":"M. Abdelhafiz, M. Yehia, H. Mostafa, T. Wafy","doi":"10.1088/2632-959X/ac2568","DOIUrl":"https://doi.org/10.1088/2632-959X/ac2568","url":null,"abstract":"Ammonium perchlorate (AP) is still one of the most important oxidizers used. Improving propellant output becomes an interesting source for many researchers. Due to its large surface area and high surface energy, nanomaterials have a wide range of applications in propellant formulations. High surface energy is responsible for the relatively low energy of activation and higher burning composition. This paper reports on a liquid-state method of synthesizing nanoscale AP. The resulting AP particles were characterized using electron scanning microscopy (SEM), energy dispersive x-ray spectrometer (EDX), x-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). Kissinger and KAS techniques were used to measure the activation energy of nanoscale AP and microscale AP. The results showed that nanoscale AP possessed stronger catalytic activity than microscale AP where the temperature of decomposition fell from 452.8 °C to 388.1 °C and the heat released increased from 835.3 J g−1 to 3127 J g−1. The findings of the kinetics study showed that the nanoscale of the synthesized AP has a direct effect on the activation energy of AP, where the activation energy of AP decreased from 226.0. kJ.mol−1 to 52.0 kJ.mol−1.","PeriodicalId":118165,"journal":{"name":"Nano Express","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116241655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toward growth of wafer-scale single-crystal hexagonal boron nitride sheets 晶圆尺度单晶六方氮化硼片的生长研究

Nano Express Pub Date : 2021-09-01 DOI: 10.1088/2632-959X/ac293b

Minsu Kim, Kyung Yeol Ma, H. Shin

引用次数: 2