Control of electronic properties of 2D carbides (MXenes) by manipulating their transition metal layers

MXenes公司 材料科学 过渡金属 碳化物 金属 八面体 半导体 密度泛函理论 凝聚态物理 结晶学 纳米技术 化学 计算化学 复合材料 冶金 晶体结构 光电子学 物理 催化作用 生物化学
作者
Babak Anasori,Chenyang Shi,Eun Ju Moon,Yu Xie,Cooper A. Voigt,Paul R. C. Kent,Steven J. May,Simon J. L. Billinge,Michel W. Barsoum,Yury Gogotsi
出处
期刊:Nanoscale horizons [Royal Society of Chemistry]
卷期号:1 (3): 227-234 被引量:478
标识
DOI:10.1039/c5nh00125k
摘要

In this study, a transition from metallic to semiconducting-like behavior has been demonstrated in two-dimensional (2D) transition metal carbides by replacing titanium with molybdenum in the outer transition metal (M) layers of M3C2 and M4C3 MXenes. The MXene structure consists of n + 1 layers of near-close packed M layers with C or N occupying the octahedral site between them in an [MX]nM arrangement. Recently, two new families of ordered 2D double transition metal carbides MXenes were discovered, M'2M''C2 and M'2M''2C3- where M' and M'' are two different early transition metals, such as Mo, Cr, Ta, Nb, V, and Ti. The M' atoms only occupy the outer layers and the M'' atoms fill the middle layers. In other words, M' atomic layers sandwich the middle M''-C layers. Using X-ray atomic pair distribution function (PDF) analysis on Mo2TiC2 and Mo2Ti2C3 MXenes, we present the first quantitative analysis of structures of these novel materials and experimentally confirm that Mo atoms are in the outer layers of the [MC]nM structures. The electronic properties of these Mo-containing MXenes are compared with their Ti3C2 counterparts, and are found to be no longer metallic-like conductors; instead the resistance increases mildly with decreasing temperatures. Density functional theory (DFT) calculations suggest that OH terminated Mo-Ti MXenes are semiconductors with narrow band gaps. Measurements of the temperature dependencies of conductivities and magnetoresistances have confirmed that Mo2TiC2Tx exhibits semiconductor-like transport behavior, while Ti3C2Tx is a metal. This finding opens new avenues for the control of the electronic and optical applications of MXenes and for exploring new applications, in which semiconducting properties are required.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
1秒前
我嘞个豆完成签到,获得积分10
1秒前
爱笑晓曼发布了新的文献求助10
2秒前
wdy111应助sc采纳,获得20
2秒前
敏感初露发布了新的文献求助10
2秒前
隐形曼青应助机智思真采纳,获得10
5秒前
思源应助时尚俊驰采纳,获得10
5秒前
可爱的函函应助敏感初露采纳,获得10
5秒前
6秒前
爆米花应助橙子采纳,获得10
9秒前
量子星尘发布了新的文献求助10
11秒前
阿满完成签到 ,获得积分10
12秒前
王馨雨完成签到,获得积分10
13秒前
在水一方应助袁涛采纳,获得10
13秒前
爱笑晓曼完成签到,获得积分10
16秒前
17秒前
18秒前
nuoran发布了新的文献求助10
19秒前
19秒前
乐乐宝完成签到,获得积分10
20秒前
21秒前
彭于晏应助阿钉采纳,获得10
22秒前
孙燕应助阿钉采纳,获得10
22秒前
整齐小松鼠应助阿钉采纳,获得10
22秒前
jszhoucl发布了新的文献求助10
23秒前
一定行发布了新的文献求助10
23秒前
jxlu发布了新的文献求助10
24秒前
26秒前
橙子发布了新的文献求助10
26秒前
科研通AI5应助科研通管家采纳,获得10
27秒前
李健应助科研通管家采纳,获得10
27秒前
爆米花应助科研通管家采纳,获得10
27秒前
乐乐应助科研通管家采纳,获得10
27秒前
天天快乐应助科研通管家采纳,获得10
27秒前
科研通AI2S应助科研通管家采纳,获得10
27秒前
CipherSage应助科研通管家采纳,获得10
28秒前
科研通AI5应助科研通管家采纳,获得10
28秒前
28秒前
华仔应助科研通管家采纳,获得10
28秒前
28秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3989378
求助须知:如何正确求助?哪些是违规求助? 3531442
关于积分的说明 11254002
捐赠科研通 3270126
什么是DOI,文献DOI怎么找? 1804887
邀请新用户注册赠送积分活动 882087
科研通“疑难数据库(出版商)”最低求助积分说明 809173