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SENSORS AND ACTUATORS B-CHEMICAL · 2017 · IF 5.401

PODS-covered PDA film based formaldehyde sensor for avoiding humidity false response

Luyu Wang,Yongpeng Yu,Qun Xiang,Jin Xu,Zhixuan Cheng,Jiaqiang Xu

To avoid false response caused by increase of environmental humidity is important for hydrophilic polydopamine (PDA) based QCM formaldehyde sensor. In order to achieve this purpose, superhydrophobic polymerized n -octadecylsiloxane (PODS) nanostructure is used to cover the surface of PDA film to prevent false response from happening. Compared with pristine PDA based QCM sensor, the sensor based on PODS-PDA composite sensing material shows satisfactory performance on avoiding false response and long-term stable formaldehyde sensing properties. This novel strategy offers a new method to reduce probability of false response resulted from humidity change.

CAS / MDL: 62-31-7 1185-53-1

研究领域: 材料科学 · 传感技术 · 环境监测

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SENSORS AND ACTUATORS A-PHYSICAL · 2022 · IF 4.291

High-sensitive ppb-level ammonia QCM sensor based on sulfur doped Ti3C2Tx MXene

Baohui Zhang,Zhiqiong Li,Chong Li,Min Li,Chen Fu,Ran Tao,Xian-hu Zha,Honglang Li,Jingting Luo

This paper demonstrates chemi-resistive type and QCM ammonia sensors based on Ti 3 C 2 T x MXene with surface engineering. The morphology and structure composition of Ti 3 C 2 T x MXene were completely tested by XRD, SEM, TEM and Raman. The ammonia sensing performance of Ti 3 C 2 T x MXene sensors at room temperature were systematically studied. The QCM sensors show better performance towards ammonia than chemi-resistor sensors. The Ti 3 C 2 T x -S QCM sensor possesses quite sensitivity (49 Hz@100 ppb), high response/recovery capability (33 s/58 s) and good selectivity . XPS was introduced for the surface element status for the potential ammonia adsorption mechanism. It can be mainly related to for lowest average potential for reaction of Ti-S and the additional absorption towards the product nitric oxides enhancing the frequency shift by absorption mass increasing. This work confirms that surface engineering of Ti 3 C 2 T x MXene to be effective method for enhancing gas sensing performance, and the sensor shows potential application for low concentration ammonia sensing.

CAS / MDL: 7789-24-4 1310-73-2 1313-82-2 7647-01-0

研究领域: 材料科学 · 传感器技术

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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES · 2016 ·Vol. 32 ·期 6 ·924-928 · IF 1.086

Studies on QCM-type NO2 gas sensor based on graphene composites at room temperature

Qi Pengjia,Wang Ziying,Wang Rui,Xu Yinan,Zhang Tong

Synthetic graphene composite was modified on a transducer of quartz crystal microbalance(QCM) to fabricate a gas sensor for low concentration nitrogen dioxide(NO 2 ) detection. The gas sensing properties of the QCM coated with SnO 2 -rGO and AgNPs-SnO 2 -rGO composites were investigated when exposing QCM to low NO 2 con-centration(2.05—20.5 mg/m 3 ) atmosphere at room temperature. The sensing performances of the QCM with AgNPs-SnO 2 -rGO composites were enhanced by the introduction of Ag nanoparticles, and the QCM modified with AgNPs-SnO 2 -rGO composites could detect NO 2 at room temperature.

CAS / MDL: 919-30-2 69-78-3 75-75-2 7631-86-9 112945-52-5 60676-86-0

研究领域: 材料科学 · 传感器技术

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PODS-covered PDA film based formaldehyde sensor for avoiding humidity false response

High-sensitive ppb-level ammonia QCM sensor based on sulfur doped Ti3C2Tx MXene

Studies on QCM-type NO2 gas sensor based on graphene composites at room temperature