Atanu Dutta - Academia.edu (original) (raw)

Papers by Atanu Dutta

Sensors and Actuators B: Chemical, 2005

An amperometric NO sensor using a LaGaO 3 base solid electrolyte was investigated based on the di... more An amperometric NO sensor using a LaGaO 3 base solid electrolyte was investigated based on the difference of catalytic activity of the electrode. It was found that oxygen pumping current increased upon exposure to NO when Sr 0.6 La 0.4 Mn 0.8 Ni 0.2 O 3 and La 0.5 Sr 0.5 MnO 3 (LSM 55) were used as active and inactive electrodes for NO oxidation, respectively. Effects of electrolyte on the sensitivity were investigated and the sensitivity to NO becomes higher with increasing oxide ion conductivity for electrolyte. By applying LaGaO 3 doped with Ni or Co, the sensitivity of the sensor becomes 1842 A per decade of NO concentration at 823 K. The oxygen pumping current linearly increased with increasing NO concentration and the sensor responded NO and recovered to the original level within 1 min. The appearance of mixed potential in potentiometric study suggests that oxidation of NO to NO 2 mainly occurs on Sr 0.6 La 0.4 Mn 0.8 Ni 0.2 O 3 electrode. Although oxygen pumping current of this sensor was slightly affected by change in oxygen partial pressure (P O 2), influence by P O 2 change is negligibly small. Cross-sensitivity study revealed that NO in exhaust gas can be selectively detected in presence of coexisting gases.

Journal of Materials Research, 2009

Three solid solutions of pyrochlores in the series Nd2-yearsGdyZr2O7 (y = 0.8, 1.0, 1.2) were syn... more Three solid solutions of pyrochlores in the series Nd2-yearsGdyZr2O7 (y = 0.8, 1.0, 1.2) were synthesized by the gel combustion method using citric acid as fuel. This results in a soft agglomerate powder as verified by dynamic light scattering. The single-phase nature of the products has been confirmed by x-ray diffraction. The increase in full width at half-maxima in the Raman spectra with an increase in Gd3+ content indicates that disorder increases with Gd3+ content. The morphology and particle size of the products were investigated by transmission electron microscopy. Scanning electron microscopy study reveals that the sintered pellets have a density higher than 92% of theoretical densities. The total ionic conductivity measurements in the temperature range 375–800 °C show that with the increase of disorder (Gd3+ content) in the system the activation energy of conduction increases from 0.98 to 1.06 eV and the preexponential factor, which is proportional to the number of mobile s...

Electrochemistry Communications, 2009

Very high electrical conductivity of ∼0.021S/cm at 600°C is obtained in Ce0.79Gd0.20Co0.01O2−δ. C... more Very high electrical conductivity of ∼0.021S/cm at 600°C is obtained in Ce0.79Gd0.20Co0.01O2−δ. Corresponding activation energy of conduction ∼0.43eV measured in the temperature range of 400–700°C is found to be notably low. Improved electrical properties with 99% of the theoretical density as obtained for these specimens, prepared using powder of average particle size ∼20nm and subsequent sintering at 1100°C, is considered

Chemistry of Materials, 2004

... Actuators, B: Chem. 2003, 93, 556. [CrossRef]. (3) Chatterjee, K.; Chatterje, S.; Banerjee, A... more ... Actuators, B: Chem. 2003, 93, 556. [CrossRef]. (3) Chatterjee, K.; Chatterje, S.; Banerjee, A.; Raut, M.; Pal, NC; Sen A.; Maiti, HS Mater. Chem. Phys. ... Res. Bull. 2004, 39, 141. [CrossRef]. (11) Dutta, A.; Ishihara, T.; Nishiguhci, H.; Takita, Y. J. Electrochem. Soc. 2004, 151, H122. ...

Journal of the Ceramic Society of Japan, 2002

Electrochemical NOx sensors for high temperature applications were prepared coupling pellets of y... more Electrochemical NOx sensors for high temperature applications were prepared coupling pellets of yttria stabilized zirconia (YSZ), an oxygen ion conductor, with a thick film of a semiconducting oxide (WO3) as an auxiliary phase. The obtained sensors were exposed to the same atmosphere without the use of reference air. Electromotive force (EMF), polarization curves and amperometric measurements were performed in air and at different concentrations of NO2 in air, at selected temperatures. Stable EMF values and fast response times were obtained. The sensors showed non-linear polarization curves. The role played by the electrolyte/ electrode interface was determined by electrochemical impedance spectroscopy (EIS) tests: exposure to NO2 did not affect the bulk but only the electrolyte/electrode interface.

Bulletin of Materials Science, 2002

... Atanu Dutta, Narin Kaabbuathong, Maria Luisa Grilli, Elisabetta Di Bartolomeo, Enrico Travers... more ... Atanu Dutta, Narin Kaabbuathong, Maria Luisa Grilli, Elisabetta Di Bartolomeo, Enrico Traversa. Abstract. ... Actuators B, 64, 102 (2000). N. Miura, H. Kurosawa, M. Hasei, G. Lu, and N. Yamazoe, Solid State Ionics, 86-88, 1069 (1996). G. Lu, N. Miura, and N. Yamazoe, J. Mater. ...

Multilayer Thin Films - Versatile Applications for Materials Engineering, 2020

Since the discovery of electron microscopes, nanomaterials and nanotechnology have been influenci... more Since the discovery of electron microscopes, nanomaterials and nanotechnology have been influencing academic and industrial research greatly for bringing out newer and better products with improved materials' properties. In the field of environmental gas sensors too, the demonstration of nanomaterials for sensing various gases has become a common practice. Environmental gas pollution has turned out to be a huge concern in the society due to the progress of civilization. The awareness of health hazard for different toxic/polluting gases and rectification measure by imposing stricter norms has prompted extensive research to develop efficient gas sensors to detect trace level of pollution from various sources. Thin film, ultrathin film, and nanostructure materials of metal oxide semiconductor, polymer, metal, carbon nanotube, graphene, etc. with or without sensitizers have been investigated for sensing various toxic gases. New device structures have been fabricated to achieve high sensitivity, selectivity, fast response, etc. The microstructure and thickness of film are found to influence the performance greatly. Various methods of preparations and mechanism of sensing are being explored. All these aspects and the challenges were discussed in this chapter.

Sensors and Actuators B: Chemical, 2018

Fabrication of a highly sensitive amperometric electrochemical gas sensor would require optimisat... more Fabrication of a highly sensitive amperometric electrochemical gas sensor would require optimisation of the electrode materials and rigorous testing of device performance under different processing conditions. An ammonia sensor based on lanthanum gallate electrolyte having the composition La0.8Sr0.2Ga0.8Mg0.1Ni0.1O3 (LSGMN) has been investigated for its detecting at ppm level. A single phase solid solution of 30 mol% Zr 4+ in CeO2 (CZ73) as an active (sensing) electrode yielded optimum results. Similarly, La0.5Sr0.5Mn0.8Ni0.2O3 (LSMN5582) was found to be the best composition for the inactive (reference) electrode. All the devices were found to have maximum sensitivity at 400ºC and a typical response and recovery times of 40s and 110s respectively. Moreover, they exhibited better efficiency in amperometric mode as compared to potentiometric mode and were stable up to several cycles of operation. It was established through mechanistic studies that even though both the electrodes were simultaneously exposed to both the gases, higher sensitivity was obtained when CZ73 was biased at +1 V with respect to LSMN5582 as against-1 V, implying that NH3 oxidation took place preferentially at CZ73 whereas oxygen reduction took place at the inactive electrode. Step by step sensitivity at 400ºC improved from 28.2 to 35 A/decade. Further, the electrolyte thickness was decreased to 0.4 mm in view of reducing the internal resistance and a prototype device was fabricated that yielded enhanced sensitivity of 49 A/decade under optimised conditions.