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Chemically Doped Random Network Carbon Nanotube p–n Junction Diode for Rectifier
Biswas, Chandan,Lee, Si Young,Ly, Thuc Hue,Ghosh, Arunabha,Dang, Quoc Nguyen,Lee, Young Hee American Chemical Society 2011 ACS NANO Vol.5 No.12
<P>Semiconductors with higher carrier mobility and carrier density are required to fabricate a p–n junction diode for high-speed device operation and high-frequency signal processing. Here, we use a chemically doped semiconducting single-walled carbon nanotube (SWCNT) random network for a field effect transistor (FET) and demonstrate a rectifier operated at a wide range of frequencies by fabricating a p–n junction diode. The p–n diode was fabricated by using a pristine p-type SWCNT-FET where half was covered by SiO<SUB>2</SUB> and the other half was chemically doped by using benzyl viologen molecules, which was converted into an n-type channel. The half-wave rectifier of the random network SWCNT p–n junction diode clearly highlights the device operation under high input signal frequencies up to 10 MHz with very low output distortion, which a commercial silicon p–n junction diode cannot access. These results indicate that the random network SWCNT p–n junction diodes can be used as building blocks of complex circuits in a range of applications in microelectronics, optoelectronics, sensors, and other systems.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-12/nn203391h/production/images/medium/nn-2011-03391h_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn203391h'>ACS Electronic Supporting Info</A></P>
Negative and Positive Persistent Photoconductance in Graphene
Biswas, Chandan,Gü,neş,, Fethullah,Loc, Duong Dinh,Lim, Seong Chu,Jeong, Mun Seok,Pribat, Didier,Lee, Young Hee American Chemical Society 2011 NANO LETTERS Vol.11 No.11
<P>Persistent photoconductance, a prolonged light-induced conducting behavior that lasts several hundred seconds, has been observed in semiconductors. Here we report persistent negative photoconductance and consecutive prominent persistent positive photoconductance in graphene. Unusually large yields of negative PC (34%) and positive PC (1652%) and remarkably long negative transient response time (several hours) were observed. Such high yields were reduced in multilayer graphene and were quenched under vacuum conditions. Two-dimensional metallic graphene strongly interacts with environment and/or substrate, causing this phenomenon, which is markedly different from that in three-dimensional semiconductors and nanoparticles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-11/nl202266h/production/images/medium/nl-2011-02266h_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl202266h'>ACS Electronic Supporting Info</A></P>
Biswas, Chandan,Lee, Young Hee WILEY‐VCH Verlag 2011 Advanced Functional Materials Vol.21 No.20
<P>Graphene and CNT exhibit excellent electronic and optoelectronic properties. In a Feature Article on page 3806, Young Hee Lee and Chandan Biswas review recent progress in carbon nanotube and graphene research. The review compares the electronic and opto‐electronic properties of carbon nanotubes and graphene, and their performances in devices such as transparent conducting films (transparency and sheet resistance) and field‐effect transistors (device types, ambipolarity, mobility, doping strategy, FET‐performance, logic and memory operations). </P>
Use of Lysozyme as a Feed Additive on In vitro Rumen Fermentation and Methane Emission
Biswas, Ashraf A.,Lee, Sung Sill,Mamuad, Lovelia L.,Kim, Seon-Ho,Choi, Yeon-Jae,Bae, Gui-Seck,Lee, Kichoon,Sung, Ha-Guyn,Lee, Sang-Suk Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.11
This study was conducted to determine the effect of lysozyme addition on in vitro rumen fermentation and to identify the lysozyme inclusion rate for abating methane ($CH_4$) production. An in vitro ruminal fermentation technique was done using a commercial concentrate to rice straw ratio of 8:2 as substrate. The following treatments were applied wherein lysozyme was added into 1 mg dry matter substrate at different levels of inclusion: Without lysozyme, 2,000, 4,000, and 8,000 U lysozyme. Results revealed that, lysozyme addition had a significant effect on pH after 24 h of incubation, with the highest pH (p<0.01) observed in 8,000 U lysozyme, followed by the 4,000 U, 2,000 U, and without lysozyme. The highest amounts of acetic acid, propionic acid (p<0.01) and total volatile fatty acid (TVFA) (p<0.05) were found in 8,000 U after 24 h of incubation. The $CH_4$ concentration was the lowest in the 8,000 U and the highest in the without lysozyme addition after 24 h of incubation. There was no significant differences in general bacteria, methanogen, or protozoan DNA copy number. So far, addition of lysozyme increased the acetate, propionate, TVFA, and decreased $CH_4$ concentration. These results suggest that lysozyme supplementation may improve in vitro rumen fermentation and reduce $CH_4$ emission.
Mechanical properties of bamboo-epoxy composites a structural application
Biswas, Sandhyarani Techno-Press 2012 Advances in materials research Vol.1 No.3
In this study, the physical and mechanical properties of bamboo fiber reinforced epoxy composites were studied. Composites were fabricated using short bamboo fiber at four different fiber loading (0 wt%, 15 wt%, 30 wt% and 45 wt%). It has been observed that few properties increases significantly with respect to fiber loading, however properties like void fraction increases from 1.71% to 5.69% with the increase in fiber loading. Hence, in order to reduce the void fraction, improve hardness and other mechanical properties silicon carbide (SiC) filler is added in bamboo fiber reinforced epoxy composites at four different weight percentages (0 wt%, 5 wt%, 10 wt% and 15 wt%) by keeping fiber loading constant (45 wt%). The significant improvement of hardness (from 46 to 57 Hv) at 15 wt%SiC, tensile strength (from 10.48 to 13.44 MPa) at 10 wt% SiC, flexural strength (from 19.93 to 29.53 MPa) at 5 wt%SiC and reduction of void fraction (from 5.69 to 3.91%) at 5 wt%SiC is observed. The results of this study indicate that using particulate filled bamboo fiber reinforced epoxy composites could successfully develop a composite material in terms of high strength and rigidity for light weight applications compared to conventional bamboo composites. Finally, SEM studies were carried out to evaluate fibre/matrix interactions.
Biswas, Ritam The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.4
In this paper the growth properties of the composition of integer translated entire and meromorphic functions in terms of their (p, q)-th order are discussed and based upon that some new results are developed.
Biswas, Nityagopal,Datta, Sanjib Kumar,Tamang, Samten Korean Mathematical Society 2019 대한수학회논문집 Vol.34 No.4
In the paper, we study the growth properties of meromorphic solutions of higher order linear differential equations with entire coefficients of [p, q] - ${\varphi}$ order, ${\varphi}$ being a non-decreasing unbounded function and establish some new results which are improvement and extension of some previous results due to Hamani-Belaidi, He-Zheng-Hu and others.
Biswas, Tanmay The Honam Mathematical Society 2019 호남수학학술지 Vol.41 No.3
In the paper we establish some new results depending on the comparative growth properties of composite entire and meromorphic functions using relative (p, q, t)L-th order and relative (p, q, t)L-th type of entire and meromorphic function with respect to another entire function.
Biswas, Tanmay,Datta, Sanjib Kumar,Shaikh, Jinarul Haque Korean Mathematical Society 2016 대한수학회논문집 Vol.31 No.4
The object of the present paper is to obtain new estimates about the (p, q)-th lower order and (p, q)-th weak type of entire functions under some interesting conditions.