Metallic versus Semiconducting SWCNT Chemiresistors: A Case for Separated SWCNTs Wrapped by a Metallosupramolecular Polymer

被引:35
作者
Ishihara, Shinsuke [1 ]
O'Kelly, Curtis J. [1 ,2 ]
Tanaka, Takeshi [4 ]
Kataura, Hiromichi [4 ]
Labuta, Jan [1 ]
Shingaya, Yoshitaka [1 ]
Nakayama, Tomonobu [1 ]
Ohsawa, Takeo [3 ]
Nakanishi, Takashi [1 ]
Swager, Timothy M. [5 ]
机构
[1] Natl Inst Mat Sci, World Premier Int Ctr Mat Nanoarchitecton WPIMANA, Tsukuba, Ibaraki 3050044, Japan
[2] Natl Inst Mat Sci, Int Ctr Young Scientists, Tsukuba, Ibaraki 3050044, Japan
[3] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan
[4] Natl Inst Adv Ind Sci & Technol, Nanomat Res Inst, Tsukuba, Ibaraki 3058565, Japan
[5] MIT, Dept Chem, Cambridge, MA 02139 USA
基金
美国国家科学基金会; 日本学术振兴会;
关键词
gas sensors; chemiresistors; chemical warfare agents; carbon nanotubes; semiconductors; supramolecular polymers; metal ligand complexes; WALL CARBON NANOTUBES; SELECTIVE DISPERSION; GAS;
D O I
10.1021/acsami.7b12992
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
As-synthesized single-walled carbon nanotubes (SWCNTs) are a mixture of metallic and semiconducting tubes, and separation is essential to improve the performances of SWCNT-based electric devices. Our chemical sensor monitors the conductivity of an SWCNT network, wherein each tube is wrapped by an insulating metallosupramolecular polymer (MSP). Vapors of strong electrophiles such as diethyl chlorophosphate (DECP), a nerve agent simulant, can trigger the disassembly of MSPs, resulting in conductive SWCNT pathways. Herein, we report that separated SWCNTs have a large impact on the sensitivity and selectivity of chemical sensors. Semiconducting SWCNT (S-SWCNT) sensors are the most sensitive to DECP (up to 10000% increase in conductivity). By contrast, the responses of metallic SWCNT (M-SWCNT) sensors were smaller but less susceptible to interfering signals. For saturated water vapor, increasing and decreasing conductivities were observed for S- and M-SWCNT sensors, respectively. Mixtures of M- and S-SWCNTs revealed reduced responses to saturated water vapor as a result of canceling effects. Our results reveal that S- and M-SWCNTs compensate sensitivity and selectivity, and the combined use of separated SWCNTs, either in arrays or in single sensors, offers advantages in sensing systems.
引用
收藏
页码:38062 / 38067
页数:6
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