A dimethyl methylphonate sensor based on HFIPPH modified SWCNTs

Abstract

In order to meet the requirements of ultra-fast real-time monitoring of sarin simulator with high sensitivity and selectivity, it is of great significance to develop high performance dimethyl methylphonate (DMMP) sensor. Herein, we proposed a DMMP sensor based on p-hexafluoroisopropanol phenyl (HFIPPH) modified self-assembled single-walled carbon nanotubes (SWCNTs) with field effect transistor (FET) structure. The self-assembly method provides a 4 nanometres thick and micron sized SWCNT channel, with high selectivity to DMMP. The proposed SWCNTs-HFIPPH based sensor exhibits remarkably higher response to DMMP than bare SWCNT based gas sensor within only few seconds. The gas sensing response of SWCNTs-HFIPPH based sensor for 1ppm DMMP is 18.2%, and the response time is about 10 seconds. What's more, the gas sensor we proposed here shows excellent selectivity and reproducibility, and the limitation of detection is as low as ppb level. The proposed method lays the foundation for miniaturization and integration of DMMP sensors, expecting to develop detection system for practical sarin sensing application.

Synergy of Two Intermolecular Hydrogen Bonds Promotes Highly Sensitive and Selective Room-Temperature Dimethyl Methylphosphonate Sensing: A Case of rGO-Based Gas Sensors

“…As presented in Figure b, the adsorption of DMMP molecules on HFIP groups was completed by the intermolecular hydrogen bond formed through PO···H–O . On the one hand, based on the hydrogen bond theory, when DMMP adsorption occurs, DMMP molecules (hydrogen bond acceptors) are more conducive to the transfer of electrons to HFIP groups (strong hydrogen bond donors), which will reduce the hole concentration in the sensing materials and increase its Fermi level to a higher level. , On the other hand, the hydrogen bond interaction-assisted adsorption mechanism leads to excellent selectivity for DMMP molecules. Previous publications have reported that the hydrogen bond energy between DMMP molecules and HFIP groups is 39.2 kJ/mol, which is significantly greater than van der Waals interaction energies (0.4–4 kJ/mol), resulting in the relatively strong adsorption capacity of sensing materials on DMMP molecules.…”

“…18 Recent research has shown that the introduction of p-hexafluoroisopropanol phenyl (HFIP) onto supports (such as SWCNTs) by a covalent functionalization approach is helpful to significantly enhance DMMP sensing properties attributed to HFIP groups, which can specifically recognize DMMP molecules through hydrogen bonds. 19 Although HFIP covalently functionalized graphene was used to construct quartz crystal microbalance (QCM)type DMMP sensors, there are no reports about the construction of chemiresistive DMMP sensors using HFIP groups, except for those based on p-hexafluoroisopropanol phenyl. 14 There is no doubt that HFIP functionalization can greatly improve sensitivity and selectivity due to the selective adsorption of DMMP molecules by HFIP groups through hydrogen bond interactions.…”

“…Particularly, the free radical addition approach using diazonium salts is one of the most commonly used methods to functionalize graphene by covalent bonds, where a relatively high content of guest materials could be introduced into the graphene matrix . Recent research has shown that the introduction of p -hexafluoroisopropanol phenyl (HFIP) onto supports (such as SWCNTs) by a covalent functionalization approach is helpful to significantly enhance DMMP sensing properties attributed to HFIP groups, which can specifically recognize DMMP molecules through hydrogen bonds . Although HFIP covalently functionalized graphene was used to construct quartz crystal microbalance (QCM)-type DMMP sensors, there are no reports about the construction of chemiresistive DMMP sensors using HFIP groups, except for those based on p -hexafluoroisopropanol phenyl .…”

Hierarchical Nanoheterostructure of HFIP-Grafted α-Fe2O3@Multiwall Carbon Nanotubes as High-Performance Chemiresistive Sensors for Nerve Agents

“…Despite a convention on the prohibition of the use of chemical weapons, there are still terrorists who use them to launch attacks against civilians, seriously endangering human security and world peace [8]. Sarin, a typical organophosphorus nerve agent, suffocates to death within 1-10 min at exposure concentrations of more than 60 ppb (parts per billion) [3,9]. Because these nerve agents are colorless, odorless, volatile, and act quickly, and human senses are unable to recognize them [10].…”