ORGANISATION/COMPANYUniversité Gustave Eiffel
RESEARCH FIELDEngineering › Electronic engineering
RESEARCHER PROFILEFirst Stage Researcher (R1)
APPLICATION DEADLINE21/03/2022 17:00 - Europe/Brussels
LOCATIONFrance › Marne-La-Vallée
TYPE OF CONTRACTTemporary
HOURS PER WEEK35
OFFER STARTING DATE03/10/2022
EU RESEARCH FRAMEWORK PROGRAMMEH2020 / Marie Skłodowska-Curie Actions COFUND
MARIE CURIE GRANT AGREEMENT NUMBER101034248
Background and scientific context:
Recently, atom-thick sheets of transition metal dichalcogenides (TMDs), such as MoS2, WS2, MoSe2, as well as other 2D materials including black phosphorus have attracted attention due to their novel properties and potential applications. Thin TMD sheets have been suggested as efficient sensing materials for next generation of gas sensing . This originates from their large surface-to-volume ratio, high electrical conductivities and low electrical noise, as well as appropriate band gap opening [2-3]. Compared to graphene, TMDs possess several advantageous properties such as the existence of a band gap in the near infrared to the visible region (depending on the number of layers), which contrasts with the zero band gap of graphene. Compared to graphene FET sensors, the novel TMDs based sensors display a much higher sensitivity [4-5]. Indeed, MoS2 FET based sensors exhibited high sensitivity for NO gas, with a detection limit down to 0.8 ppm . Compared to gas sensors based on carbon nanotubes, the MoS2-type sensor exhibits higher selectivity towards volatile organic compounds (VOCs) at room temperature . The response of TMDs upon exposure to other gas molecules like NO2, NH3, H2S, H2, O2, H2O, CO, CH4, CO2, trimethylamine, acetone, methanol, dichloromethane, isopropanol and chloroform was studied [7-10]. As reported for graphene, sensors based on TMDs materials do not show any specific selectivity to gas. Various strategies have been studied to enhance the selectivity of 2D materials to specific gases such as functionalization by using chosen chemical species. Several recent theoretical and experimental studies reported that surface functionalization of TMDs can drastically improve the detection of toxic gases in terms of response and selectivity . To improve TMDs gas-sensing performance, we propose an alternative approach based on functionalizing TMDs by porphyrins and/or phthalocyanines. This approach constitutes the first ever demonstration of functionalization of TMDs by metal complexes for gas sensing applications. We have previously reported that these molecules physi-adsorbed on the surface of carbon nanotubes and graphene and the presence of a weak charge transfer between those grafted molecules and the nanomaterials [12-14]. Furthermore, these organometallic molecules present exceptional properties such as high chemical stability, combined to unique physical and structural properties . The originality of this approach lies in the nature of the ligand cavity of porphyrin or phthalocyanines that allows the coordination of different metal ions, thus enabling the sensing of different gas molecules and enhancing selectivity.
The main goal of this PhD proposal is to develop a new simple-to-use miniaturized gas sensor based on TMD materials (such as MoS2, WS2, etc.) that will be used to selectively and sensitively detect and quantify of NOx and CO pollutants in various environments. To this aim we will: 1) develop wet-method to produce exfoliated 2D-TMD materials, 2) study surface functionalization of new 2D materials with no-covalent binding of molecular probes for targeted gas, 3) study how surface functionalization modify the optoelectronic properties of 2D-materials; 4) fabrication of electrically transduced gas sensor and characterization of its behavior. The project covers all aspects from the fabrication and packaging of sensors to the range of functional testing in the laboratory in real conditions. If successful, this project will open up new possibilities to detect various pollutants and toxic industrial chemicals compounds. This project is a collaborative work between three partners: NACRE (LISIS-UGE and LPICM-Ecole Polytechnique), MSME, and INL-Braga.
Within this thesis, we will explore an alternative approach which consists in the use of different 2D materials/functionalizations within the same sensor, in order to identify a typical signature of this gas through the response of several TMD resistors. The influence of the sensor temperature on its response time will also be studied and the use of an integrated resistor (heater) will be considered. In parallel to this experimental work, we will develop a theoretical model of these sensors to provide guidelines for their optimal design.
Research program and Role of the partners:
- Theoretical study (MSME-UGE);
- Fabrication and functionalization of resistive devices (NACRE, INL);
- Assessing a sensitivity and selectivity to different gases (NACRE);
- The integration of the devices into communicating systems and the evaluation of their performances under “Sense City” (NACRE);
 S. Cui et al. Nature Communications, 6, (2015) 8632 (https://doi.org/10.1038/ncomms9632).
 Q. H. Wang et al. Nat. Nanotechnol., 7 (2012) 699 (https://doi.org/10.1038/nnano.2012.193)
 H. Li et al. Nat. Mater., 15 (2016) 48 (https://doi.org/10.1038/nmat4465)
 H. Li et al., Small 8 (2012) 63 (doi: 10.1002/smll.201101016)
 B. Liu et al., ACS Nano 8 (2014) 11 (https://doi.org/10.1021/nn501226z)
 W. Yang et al., Inorg. Chem. Front. 3 (2016) 433 (https://doi.org/10.1039/C5QI00251F)
 N. Huo et al. Sci. Rep. 4 (2014) 5209 (doi: 10.1038/srep05209)
 H. Zhang et al., Sens. Actuators, B, 190 (2014) 472–478 (http://dx.doi.org/10.1016/j.snb.2013.08.067)
 B. Liu et al. ACS Nano 8 (2014) 5304−5314 (https://doi.org/10.1021/nn5015215)
 W. Li et al., Sensors 19 (2019) 2123 (doi:10.3390/s19092123).
 C. Nie et al., J.Phys. Chem. C 124 (2020) 16943−16950 (https://dx.doi.org/10.1021/acs.jpcc.0c02657)
[12 ] F. Bouanis et al, Organic Electronics 96 (2021) 106212 (https://doi.org/10.1016/j.orgel.2021.106212)
 F. Bouanis et al. DIB (2021) 107366 (https://doi.org/10.1016/j.dib.2021.107366)
 M. Dieng et al. App. Sur. Sci. (submitted paper)
 M. Ethirajan, Chem. Soc. Rev. 40 (2011) 340 –362 (doi: 10.1039/b915149b)." Capteurs Matériaux 2D Sensors 2D materials Functionalization
A 3-month secondment at Minho University (Portugal). For more information, contact the PhD thesis supervisor.
- High-quality doctoral training rewarded by a PhD degree, delivered by Université Gustave Eiffel.
- Access to cutting-edge infrastructures for research & innovation.
- Appointment for a period of 36 months based on a salary of 2 700 € (gross salary per month).
- Job contract under the French labour legislation in force, respecting health and safety, and social security: 35 hours per week contract, 25 days of annual leave per year.
- International mobility will be mandatory.
- An international environment supported by the adherence to the European Charter & Code.
- Access to dedicated CLEAR-Doc trainings with a strong interdisciplinary focus, together with a Career development Plan.
- At the time of the deadline, applicants must be in possession or finalizing their Master’s degree or equivalent/postgraduate degree. At the time of recruitment, applicants must be in possession of their Master’s degree or equivalent/postgraduate degree which would formally entitle to embark on a doctorate.
At the time of the deadline, applicants must be in the first four years (full-time equivalent research experience) of their research career (career breaks excluded) and not yet been awarded a doctoral degree. Career breaks refer to periods of time where the candidate was not active in research, regardless of his/her employment status (sick leave, maternity leave etc). Short stays such as holidays and/or compulsory national service are not taken into account.
At the time of the deadline, applicants must not have resided or carried out their main activity (work, studies, etc.) in France for more than 12 months in the 3 years immediately prior to the call deadline.
Applicants must be available to start the programme on schedule (around 1st October 2022).
Please refer to the Guide for Applicants available on the CLEAR-Doc website.
- The First step before applying is contacting the PhD supervisor. You will not be able to apply without an acceptation letter from the PhD supervisor.
- Please contact the PhD supervisor for any additional detail on job offer.
- There are no restrictions concerning the age, gender or nationality of the candidates. Applicants with career breaks or variations in the chronological sequence of their career, with mobility experience or with interdisciplinary background or private sector experience are welcome to apply.
- Support service is available during every step of the application process by email: email@example.com
Web site for additional job details
REQUIRED EDUCATION LEVELEngineering: Master Degree or equivalent
REQUIRED LANGUAGESENGLISH: Good
- At the time of the deadline, applicants must be in possession or finalizing their Master’s degree or equivalent/postgraduate degree.
- At the time of recruitment, applicants must be in possession of their Master’s degree or equivalent/postgraduate degree which would formally entitle to embark on a doctorate.
A 3-month secondment at Minho University (Portugal).
EURAXESS offer ID: 718146
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