Article
Engineering, Electrical & Electronic
Haonan Chen, Dongzhi Zhang, Qiannan Pan, Xiaoshuang Song
Summary: This paper presents an accurate and reliable QCM humidity sensor based on metal-organic frameworks (MOFs)-derived SnO2/chitosan (CS) nanostructure, which exhibits high sensitivity, short response time, excellent selectivity, and stability for potential applications in identifying humidity change and analyzing aspiration status. The resonant behavior and water molecules adsorption/desorption dynamics on the MOF-SnO2/CS composite are analyzed, revealing the potential of this sensor in humidity sensing applications.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Analytical
Vo Thanh Duoc, Chu Manh Hung, Hugo Nguyen, Nguyen Van Duy, Nguyen Van Hieu, Nguyen Duc Hoa
Summary: The grafted structures between SnO2 and ZnO nanowires were achieved through a two-step growth process, showing promising sensitivity for NO2 gas sensing.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Sukhwinder Singh, Jyotirmoy Deb, Jatinder Vir Singh, Utpal Sarkar, Sandeep Sharma
Summary: By using a heterostructure-based design with a MoSe2/SnO2 composite, sensitive and selective detection of ethyl mercaptan at room temperature has been achieved. The composite shows detection capability for ethyl mercaptan over a wider range of relative humidity and exhibits adsorption selectivity towards ethyl mercaptan compared to other analytes. The device also maintains stable response even at extreme humidity levels.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Zhi Yan Lee, Huzein Fahmi bin Hawari, Gunawan Witjaksono bin Djaswadi, Kamarulzaman Kamarudin
Summary: The study of a tin oxide (SnO2) and reduced graphene oxide (rGO) hybrid composite gas sensor for high-performance carbon dioxide (CO2) gas detection at room temperature shows excellent response magnitudes, good linearity, and low detection limit, making it suitable for a wide range of CO2 concentration detection.
Article
Chemistry, Physical
Huimin Yu, Longhui Dai, Yangquan Liu, Yue Zhou, Ping Fan, Jingting Luo, Aihua Zhong
Summary: Superior NH3 sensors with high response and stability were successfully obtained by wrapping SnO2 nanoparticles on Ti3C2Tx MXene nanosheets via a facile hydrothermal method. The Ti3C2Tx MXene-SnO2 composite exhibited excellent NH3 gas detection at room temperature with a response as high as 75% for 500 ppm NH3 gas. The composite also showed fast response and recovery times of 109 and 342 s, respectively. Moreover, the Ti3C2Tx MXene-SnO2 composite demonstrated high selectivity and stability for NH3 gas sensing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Hamide Mohammad Aliha, Abbas Ali Khodadadi, Yadollah Mortazavi, Mohammad Nader Lotfollahi
Summary: The aim of this study is to investigate a new method of fabricating SnO2/polyaniline (PAni) nanocomposite sensors for detecting ammonia at room temperature. The synthesis of PAni is conducted through oxidative polymerization, and SnO2/PAni hybrid nanocomposites with varying percentages of polymer are fabricated using a deposition-precipitation method in the presence of SnCl4 solution. XRD, BET, FTIR, Raman, TGA, and FESEM tests are carried out to characterize the produced powders. The results show that increasing the PAni content in the nanocomposites leads to a decrease in SnO2 crystallite size, an increase in surface area, and improved thermal stability. The SnO2/8 wt% PAni exhibits the highest sensitivity, with a response of approximately 187% for 100 ppm NH3 at room temperature. The optimal heteronucleation and decoration of SnO2 on the PAni surface enhance the sensor's response. Additionally, the sensor demonstrates selectivity in the presence of interfering gases such as CO, ethanol, methane, toluene, and trichloroethylene.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Analytical
Sadegh Hasanpour, Lucas Karperien, Tavia Walsh, Maryam Jahanshahi, Zhina Hadisi, Katie J. Neale, Brian R. Christie, Ned Djilali, Mohsen Akbari
Summary: Textile humidity and temperature sensors have various applications in clothing, wound management, and patient health monitoring. A multi-step roll to roll dip-coating method was used to produce nano-particle infused cotton threads with a fluorinated ethylene propylene (FEP) coating. The developed hybrid sensor integrates FEP-coated threads and non-coated threads to enable rapid measurement of relative humidity and temperature changes.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Myung Sik Choi, Han Gil Na, Jae Hoon Bang, Ali Mirzaei, Seungmin Han, Ha Young Lee, Sang Sub Kim, Hyoun Woo Kim, Changhyun Jin
Summary: Gas sensors were fabricated by decorating amorphous carbon layers on SnO2 nanowires, without the need for pretreatment or functionalization, and operated at room temperature. The amorphous carbon increased surface area and improved NO(2) gas sensing by providing electronic effects to the SnO2.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Lili Li, Chenguang Wang, Zhihua Ying, Wei Wu, Yongqian Hu, Weihuang Yang, Weipeng Xuan, Yang Li, Fei Wen
Summary: This paper reported a low concentration CO gas sensor based on SnO2 modified graphene nanocomposite at 25 degrees C. The SnO2/graphene nanocomposite exhibited higher CO gas sensing performance than pure SnO2, showing a high response to CO at 25 degrees C, shorter response and recovery times, excellent repeatability and stability. The excellent CO sensing performance of the composite is attributed to graphene's ability to provide a large surface area for adsorption sites and prevent the disagglomeration of SnO2 nanoparticles.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Jiannan Song, Zhongtang Xu, Menghan Wu, Xilai Lu, Zhiqiao Yan, Feng Chen, Wanping Chen
Summary: Composite ceramics of metal oxides and noble metals have been widely studied for sensing reducing gases at room temperature. In this study, composite ceramics of SnO2 and noble metals were prepared and found to be effective in sensing oxidizing NO2 at room temperature. The Pt-Au-SnO2 composite nanoceramics showed the largest increase in resistance when exposed to NO2, with a high response and fast recovery time. The presence of water molecules in the air was found to be crucial for the recovery of resistance in the composite ceramics. Overall, this study establishes a room temperature NO2-sensing mechanism and highlights the potential of composite ceramics for sensing both reducing and oxidizing gases at room temperature.
Article
Engineering, Electrical & Electronic
Meihua Li, Yunfan Zhang, Xiaodong Gao, Yunlong Gu, Chao Mou, Guangfen Wei
Summary: This paper presents a room temperature ammonia sensor without heating device. Three-dimensional hierarchical SnS2 nanoflowers were obtained by hydrothermal synthesis and subsequent calcination at 450 degrees C. Gas sensing performance of the sensors was systematically investigated for ammonia at 20 +/- 2 degrees C. S-doped SnO2 showed improved response, selectivity and stability compared to pristine SnS2, possibly due to its enhanced conductivity and the unique 3D hierarchical nanoflower structure. The results suggest that 3D hierarchical S-doped SnO2 nanoflowers are promising for ammonia detection.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Surbhi Priya, Joyanti Halder, Debabrata Mandal, Ananya Chowdhury, Trilok Singh, Amreesh Chandra
Summary: This paper discusses the use of SnO2 hollow structures as the chemically active component in VOC sensors, proposing a new sensing strategy for detecting VOCs such as ethanol, methanol, acetone, toluene and formaldehyde with high selectivity and sensitivity.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Chethana Aranthady, Ganapati Shanbhag, Nalini G. Sundaram
Summary: Efficient CO sensors that can detect low concentration CO at room temperature are important. In this study, a Ta2O5-SnO2-PANI hybrid composite was developed for efficient CO sensing at room temperature and low concentrations. The hybrid material showed superior performance with high sensitivity, low operating temperature, and fast response and recovery time. These enhancements are attributed to the conductivity of PANI, improved oxygen vacancies, and the heterostructure formed between PANI and the (Ta2O5-SnO2) composite.
Article
Nanoscience & Nanotechnology
Xiaorui Liang, Lei Zhang, Qiulin Tan, Wenhua Cheng, Dan Hu, Shuang Li, Lin Jing, Jijun Xiong
Summary: This paper presents a SAW sensor based on coplanar integrated LGS, fabricated using wet etching, high-temperature bonding, and IBE processes. The miniaturized TPH sensor used the MMG composite to widen the humidity detection range and improve the sensitivity, with fast response time (3.18 s) and recovery time (0.94 s). It can operate steadily between 25-700°C, 0-700 kPa, and 10-98% RH, and address coupling issues among multiple parameters in complex environments by decoupling the Δf-temperature coupling factor.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Estacio P. de Araujo, Cleber A. Amorim, Adryelle N. Arantes, Adenilson J. Chiquito
Summary: In this study, a SnO2 nanowire network was used as an active layer in a metal-semiconductor-metal (MSM) structured acetone gas sensor. The sensor showed good crystallographic characteristics and desired nanowire morphology, and exhibited efficient response to acetone gas within a certain concentration range at room temperature.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Navpreet Kaur, Mandeep Singh, Andrea Casotto, Luigi Sangaletti, Elisabetta Comini
Summary: Researches have developed a novel strategy to enhance the sensing performance of p-type NiO by utilizing the unique functional properties of self-assembled monolayers. By modulating the hole concentration near the surface of NiO nanowires using terminal epoxy groups, the electron transfer from reducing gases to the nanowires' surface is increased. As a result, the SAM-functionalized sensors exhibit a 9-fold higher response at low temperatures compared to bare NiO nanowires.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Marwa Ben Arbia, Ilkay Demir, Navpreet Kaur, Faouzi Saidi, Dario Zappa, Elisabetta Comini, Ismail Altuntas, Hassen Maaref
Summary: In this study, the structural dependences of InGaAs ternary compound were investigated using XRD, SEM-EDX, Raman, UV-vis, and PL techniques. The results showed successful growth of InGaAs as an active layer on InP substrate with good crystallinity and high indium concentration. The formation of an interfacial layer and the non-uniform distribution of indium were observed. The luminescence behavior of InGaAs was found to be influenced by the indium distribution, and a numerical simulation was developed to explain this anomaly.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Andrea Tognazzi, Paolo Franceschini, Davide Rocco, Luca Carletti, Andrea Locatelli, Marco Gandolfi, Dario Zappa, Alfonso Carmelo Cino, Elisabetta Comini, Giuseppe Leo, Costantino De Angelis
Summary: We investigate the generation of second harmonic in dielectric nanocylinders, considering the incident field wavelength and geometrical dimensions. We find that, surprisingly, the second harmonic efficiency is not reduced by the increase of the imaginary part of the complex dielectric refractive index. The presence of higher order multipoles supported by the resonators at the fundamental wavelength can boost the generated second harmonic signal even in the dielectric absorption spectral region, achieving similar nonlinear efficiency as the lossless case.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Analytical
Mandeep Singh, Navpreet Kaur, Andrea Casotto, Luigi Sangaletti, Elisabetta Comini
Summary: We propose a novel active sensing surface based on mixed-SAMs functionalized ZnO nanowires for selective detection of acetone. Mixed-SAMs not only enhance the sensing performance of bare ZnO nanowires, but also show superior selectivity when suitable mixing ratios are chosen. The molecular interaction between the acetone CO group and terminal-CH3 and -NH2 groups of SAMs leads to a high response value of 256 +/- 36 (50 ppm) for the mixed-SAMs functionalized NWs. The effect of the mixing ratio on the sensing performance is systematically discussed, highlighting the key role played by the variation in charge distribution and modification in molecular interactions.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Ruonan Tian, Zeyuan Gao, Gang Chen, Hongtao Guan, Chengjun Dong, Elisabetta Comini
Summary: In this study, a sol-gel method followed by a thermal treatment was used to control the phases formation of mesoporous iron oxide. It was found that mixed alpha/gamma-Fe2O3 phases showed enhanced sensing performances towards acetone. Additionally, coupling alpha/gamma-Fe2O3 with 2D materials of MXene prevented agglomeration of Fe2O3 nano-particles and increased the number of active sites for chemical absorption. Furthermore, the p-n heterojunctions resulted in an enhanced response towards acetone.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Physical
Melike Sener, Orhan Sisman, Necmettin Kilinc
Summary: The effects of porosity and thickness on hydrogen sensing ability are demonstrated with a comparison of compact and nanoporous platinum film sensors. Anodic aluminum oxide (AAO) nanotubes were used as a template to fabricate nanoporous Pt films through an anodization method. Nanoporous Pt showed higher sensitivity and surface scattering phenomenon explained the hydrogen sensing mechanism.
Article
Chemistry, Analytical
Aris Liboa, Dario Genzardi, Estefania Nunez-Carmona, Sonia Carabetta, Rosa Di Sanzo, Mariateresa Russo, Veronica Sberveglieri
Summary: Beer is the most consumed alcoholic beverage and diacetyl is a byproduct of yeast metabolism in breweries. The perception of diacetyl varies in different beers, but inhalation of it is toxic. Diacetyl analysis can be done using metal oxide sensors, which are fast and cost-effective. Testing different types of beer with electrochemical sensors has shown excellent ability to detect and differentiate diacetyl concentrations.
Article
Chemistry, Physical
Orhan Sisman, Dario Zappa, Valentin-Adrian Maraloiu, Elisabetta Comini
Summary: The study proposes an inverse design by depositing n-type ZnO shell layers on the surface of p-type CuO core-shell nanowires to understand their conductometric gas-sensing kinetics. The surface morphologies of bare and core-shell nanowires were investigated using FE-SEM. The ZnO shell layer was observed using EDX and HRTEM techniques. The deposition of ZnO shell layers switched the intrinsic p-type sensing behavior of CuO nanowires towards hydrogen to n-type.
Article
Chemistry, Physical
Gianluca D'Olimpio, Vardan Galstyan, Corneliu Ghica, Mykhailo Vorokhta, Marian Cosmin Istrate, Chia-Nung Kuo, Chin Shan Lue, Danil W. W. Boukhvalov, Elisabetta Comini, Antonio Politano
Summary: In this work, solution-processed In2Se3 nanosheets are shown to have exceptional selectivity and sensitivity to NO2 gas, making them a promising candidate for gas detection systems. The unique surface properties of In2Se3 nanosheets prevent oxidation and CO-poisoning, while enabling stable adsorption of NO2 molecules. This makes In2Se3 an ideal material for gas sensing applications in humid and harsh environments.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Navpreet Kaur, Dario Zappa, Elisabetta Comini
Summary: Metal oxide nanowires and novel heterostructures were synthesized using different techniques and integrated into a gas sensing platform. Nanowires were synthesized using thermal oxidation and VLS mechanism, while heterostructures (such as NiO/ZnO and NiO/NiWO4/WO3) were synthesized using VLS and VS mechanisms. Detailed investigations revealed the dependence of sensor selectivity and sensitivity on nanowire synthesis techniques. The superior performance of heterostructures compared to bare nanowires presents a novel pathway to enhance the performance of nanostructured gas sensors.
2023 IEEE 36TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS
(2023)
Article
Chemistry, Multidisciplinary
Ruonan Tian, Zeyuan Gao, Ruifeng Lang, Na Li, Huilin Gu, Gang Chen, Hongtao Guan, Elisabetta Comini, Chengjun Dong
Summary: This study presented a novel synthesis method of iron-glycerate and explored the effects of different thermal treatments on its properties. It was found that the dual phases of alpha/gamma-Fe2O3 exhibited better sensing performance for acetone detection. Additionally, the sensor performance was further improved by doping with nickel and functionalizing with ruthenium nanoparticles.
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2023)
