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Raman investigation of air-stable silicene nanosheetson an inert graphite surface

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Nano Research 2018年第11期11卷 5879-5889页

作者： Paola Castrucci Filippo Fabbri Tiziano delise Manuela Scarselli Matteo Salvato Sara Paseale Roberto Francini Isabelle Berbezier Christoph Lechner Fatme Jardali Holger Vach maurizio de crescenzi Dipartimento di Fisica Universita di Roma 'Tor Vergata' Roma 00133 Italy Center for Nanotechnology Innovation c/o NEST Istituto Italiano di Tecnologia Pisa 55127 Italy Consorzio di Ricerca Hypatia c/o Italian Space Agency Roma O0133 Italy Dipartimento di Ingegnefia Industfiale Universita di Roma "For Vergata" Roma O0133 Italy CNRS Aix-Marseille UniversitY IM2NP UMR 7334 Marseille 13397 France EDF R&D Department Matefials and Mechanics of Components (MMC) Moret-sur-Loing 77818 France CNRS-LPICM Ecole Polytechnique Universitd Paris-Saclay Palaiseau 91128 France

The fascinating properties of two dimensional (2D) crystals have gained increasing interest for many applications. The synthesis of a 2D silicon structure, namely silicene, is attracting great interest for possible development of next generation electronic devices. The main difficulty in working with silicene remains its strong tendency to oxidation when exposed to air as a consequence of its relatively highly buckled structure. In this work, we univocally identify the Raman mode of air-stable low-buckled silicene nanosheets synthesized on highly oriented pyrolytic graphite (HOPG) located at 542.5 cm−1. The main focus of this work is Raman spectroscopy and mapping analyses in combination with ab initio calculations. Scanning tunneling microscopy images reveal the presence of a patchwork of Si three-dimensional (3D) clusters and contiguous Si areas presenting a honeycomb atomic arrangement, rotated by 30° with respect to the HOPG substrate underneath, with a lattice parameter of 0.41 ± 0.02 nm and a buckling of the Si atoms of 0.05 nm. Raman analysis supports the co-existence of 3D silicon clusters and 2D silicene. The Raman shift of low-buckled silicene on an inert substrate has not been reported so far and it is completely different from the one calculated for free-standing silicene and the ones measured for silicene grown on Ag(111) surfaces. Our experimental results are perfectly reproduced by our ab initio calculations of deposited silicene nanosheets. This leads us to conclude that the precise value of the observed Raman shift crucially depends on the strain between the silicene and the HOPG substrate.

关键词： 2D materials silicene Raman spectroscopy ab initio calculations scanning tunneling microscopy scanning tunneling spectroscopy

Liver involvement in the course of thymoma-associated multiorgan autoimmunity:The first histological description

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Hepatobiliary & Pancreatic Diseases International 2022年第1期21卷 86-89页

作者： Fabrizio Citarella Umberto Vespasiani-Gentilucci Anna crescenzi Antonella Bianchi Vladimir Virzì Giuseppe Tonini department of Medical Oncology Policlinico Universitario Campus Bio-Medicovia Alvaro del PortilloRome 00128Italy Area of Internal Medicine Unit of HepatologyPoliclinico Universitario Campus Bio-Medicovia Alvaro del PortilloRome 00128Italy Unit of Pathology Policlinico Universitario Campus Bio-Medicovia Alvaro del PortilloRome 00128Italy

To the Editor:Thymoma-associated multiorgan autoimmunity(TAMA)is a rare paraneoplastic syndrome described in patients with thymoma and characterized by multiorgan failure and graft-versus-host dis-ease(GVHD)like pathology affecting the skin,the gastrointestinal tract,and the *** date,only 21 cases are reported in liter-ature[1],with some patients presenting gastrointestinal and hep-atic manifestations,mainly colitis,diarrhea,and abnormal liver en-zymes,but the hepatic involvement has not been histologically characterized yet.

关键词： involvement gastrointestinal diarrhea

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反渗透/电去离子:食品和饮料实验室首选净水技术

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生命科学仪器 2007年第6期5卷 43-45页

作者： Greg crescenzi Morgan Norris Business development Manager Millipore Corp. Bioscience Div. 290 Concord Rd. Billerica MA 01923 U.S.A. Product Marketing Manager Millipore Corp. Bioscience Div. 290 Concord Rd. Billerica MA 01923 U.S.A.

目前,人们对食品饮料的分析检验的要求越来越严格。随着分析灵敏度的提高,人们对食品饮料分析中用水的质量提出了更高的要求。许多实验室仍然采用蒸馏的方法来生产纯水,但是采用能够提供更高水质的反渗透和电去离子系统更经济。

关键词：食品饮料净水技术实验室反渗透电去离子灵敏度子系统水质

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超场效应晶体管—用于高增益放大器的单片器件

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微纳电子技术 1982年第4期 37-43页

作者： E·James crescenzi 袁明文

业已证明单片的GaAs集成电路是混合电路组件中的普通分立器件的合算替换者。其主要的优点是尺寸小、增益高和响应较平坦。

关键词：场效应晶体管单极晶体管场效应器件器件高增益放大器单片

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出生时的体重和McGoon指数对先天性膈疝新生儿患者死亡率的预测作用

作者： (美)安东尼·克里森兹(Anthony crescenzi)

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世界核心医学期刊文摘（儿科学分册） 2006年第5期2卷 32-33页

作者： Casaccia G. crescenzi F. Dotta A. 刘凯 Neonatal Surgery Unit Department of Medical and Surgical Neonatology Bambino GesúChildren's Hospital-IRCCS 00165 Rome Italy.Dr

Background: despite improvements in clinical management, mortality of congenital diaphragmatic hernia (CDH) remains high. Early prediction of mortality risk helps in comparing strategies and/or performances of different centers. Birth weight (BW), Apgar Score at 5 minutes, and modified McGoon Index (MGI) calculated by the ratio between the diameters of pulmonary arteries and the descending aorta have been used to determine mortality of CDH. Aim: The purpose of this study is to evaluate the relationship between early detectable variables and survival in newborns with CDH intubated at birth, managed with “gentle”ventilation and delayed surgery. Methods: All medical records of patients affected by highrisk CDH and treated with a standardized protocol at Bambino GesúChildren’s Hospital, Rome, Italy, between January 2002 and September 2004 were reviewed. Prenatal diagnosis, gestational age, BW, sex, side of hernia, and MGI were recorded on admission. The relationship with mortality of each variable was evaluated by univariate analysis. Subsequently, a predictive model of mortality was developed using a logistic regression: the explanatory variables, BW, and MGI were dichotomized in high (HBW and HMGI) and low (LBW and LMGI) according to the best cutoff found with receiver-operating characteristic curves. Results: Thirty-four newborns with CDH, treated with a standardized protocol, were studied. The main characteristics of the 34 patients were BW, 2886 g (1500-3620 g); gestational age, 37.7 weeks (32-42 weeks); male/female, 22/12; right/left, 8/26; prenatal diagnosis, 29; MGI, 1.31 (0.9-1.85). Only BW and MGI were significantly (P dependently associated with mortality in the multivariate analysis. Using the 4 possible combinations, the LBW

关键词：新生儿患者先天性膈疝预测作用死亡率出生时指数体重 Apgar评分死亡危险率主动脉直径

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化学就是这么简单

化学就是这么简单