Electric field effects on the adsorption of formaldehyde molecule on the ZnO nanotube surface: A theoretical investigation

Farmanzadeh, Davood; Tabari, Leila

doi:10.1016/j.comptc.2013.04.016

Cited by 28 publications

(15 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Formaldehyde (HCHO) is a colorless volatile organic compound (VOC) with a strong, pungent-smelling that can be toxic, allergenic and carcinogenic [ 1 ]. Breathing air containing low levels of HCHO can cause damage to the human body, such as central nervous system damage, blood and immune system disorders, as well as bronchospasm, pneumonia and respiratory disease [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

Tai

Jiang

et al. 2015

Sensors

View full text Add to dashboard Cite

A thin-film transistor (TFT) having an organic–inorganic hybrid thin film combines the advantage of TFT sensors and the enhanced sensing performance of hybrid materials. In this work, poly(3-hexylthiophene) (P3HT)-zinc oxide (ZnO) nanoparticles' hybrid thin film was fabricated by a spraying process as the active layer of TFT for the employment of a room temperature operated formaldehyde (HCHO) gas sensor. The effects of ZnO nanoparticles on morphological and compositional features, electronic and HCHO-sensing properties of P3HT-ZnO thin film were systematically investigated. The results showed that P3HT-ZnO hybrid thin film sensor exhibited considerable improvement of sensing response (more than two times) and reversibility compared to the pristine P3HT film sensor. An accumulation p-n heterojunction mechanism model was developed to understand the mechanism of enhanced sensing properties by incorporation of ZnO nanoparticles. X-ray photoelectron spectroscope (XPS) and atomic force microscopy (AFM) characterizations were used to investigate the stability of the sensor in-depth, which reveals the performance deterioration was due to the changes of element composition and the chemical state of hybrid thin film surface induced by light and oxygen. Our study demonstrated that P3HT-ZnO hybrid thin film TFT sensor is beneficial in the advancement of novel room temperature HCHO sensing technology.

show abstract

Section: Introductionmentioning

confidence: 99%

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

Tai

Jiang

et al. 2015

Sensors

View full text Add to dashboard Cite

show abstract

“…Formaldehyde is associated with many health risk factors and has been identified as a major cause of sick building syndrome 1,2 . The World Health Organization has set a 30 min exposure limit of 0.08 ppm.…”

Section: Introductionmentioning

confidence: 99%

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO₄ modified ZnO nanoparticles

et al. 2015

View full text Add to dashboard Cite

A light activated miniature formaldehyde sensor working at room temperature is fabricated by CdSO4 modified ZnO nanoparticles. The CdSO4 is deposited on the surface of the ZnO nanoparticles as a separated phase rather than doping into the lattice of ZnO. The Cd 2+ and SO4 2on the surface play a synergic effect for the high sensitivity to formaldehyde. The sensor shows high sensitivity to formaldehyde, with detection limit lower than 1 ppm while shows no response to ethanol and very weak response to acetone. With engineering efforts, a highly compact prototype formaldehyde sensor is obtained, which is very convenient for portable formaldehyde specific detection.

show abstract

“…However, these calculations were largely lacking for semiconductors, oxides and other insulators until recent studies on Si, MgO, and ZnO [15][16][17][18][19] for which the theoretical framework was developed. Related theoretical works on the effects of electric fields (<1 V/Å ) on ZnO-graphene composites, 20 formaldehyde adsorption on ZnO nanotubes, 21 and ZnO nanowires and nanotubes 22 show a reduction in the band gap or HOMO-LUMO gap of ZnO with an increase in the electric field as we had shown earlier for MgO. 17 In low electrostatic fields, typically below $0.1 V/Å , atoms, molecules, and condensed matter only get polarized; we call these effects physical.…”

Section: Introductionmentioning

confidence: 99%

Field evaporation of ZnO: A first-principles study

Karahka

Kreuzer

2015

Journal of Applied Physics

View full text Add to dashboard Cite

With recent advances in atom probe tomography of insulators and semiconductors, there is a need to understand high electrostatic field effects in these materials as well as the details of field evaporation. We use density functional theory to study field effects in ZnO clusters calculating the potential energy curves, the local field distribution, the polarizability, and the dielectric constant as a function of field strength. We confirm that, as in MgO, the HOMO-LUMO gap of a ZnO cluster closes at the evaporation field strength signaling field-induced metallization of the insulator. Following the structural changes in the cluster at the evaporation field strength, we can identify the field evaporated species, in particular, we show that the most abundant ion, Zn2+, is NOT post-ionized but leaves the surface as 2+ largely confirming the experimental observations. Our results also help to explain problems related to stoichiometry in the mass spectra measured in atom probe tomography.

show abstract

Electric field effects on the adsorption of formaldehyde molecule on the ZnO nanotube surface: A theoretical investigation

Cited by 28 publications

References 66 publications

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO₄ modified ZnO nanoparticles

Field evaporation of ZnO: A first-principles study

Contact Info

Product

Resources

About

Electric field effects on the adsorption of formaldehyde molecule on the ZnO nanotube surface: A theoretical investigation

Cited by 28 publications

References 66 publications

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO4 modified ZnO nanoparticles

Field evaporation of ZnO: A first-principles study

Contact Info

Product

Resources

About

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO₄ modified ZnO nanoparticles