Now showing items 1-20 of 32

    • 3D Macroporous Solids from Chemically Cross-linked Carbon Nanotubes 

      Ozden, Sehmus; Narayanan, Tharangattu N.; Tiwary, Chandra S.; Dong, Pei; Hart, Amelia H.C.; Vajtai, Robert; Ajayan, Pulickel M. (2014)
      Suzuki reaction for covalently interconnected 3D carbon nanotube (CNT) architectures is reported. The synthesis of 3D macroscopic solids made of CNTs covalently connected via Suzuki cross-coupling, a well-known carbon-carbon ...
    • Ambient solid-state mechano-chemical reactions between functionalized carbon nanotubes 

      Kabbani, Mohamad A.; Tiwary, Chandra Sekhar; Autreto, Pedro A.S.; Brunetto, Gustavo; Som, Anirban; Krishnadas, K.R.; Ozden, Sehmus; Hackenberg, Ken P.; Gong, Yongi; Galvao, Douglas S.; Vajtai, Robert; Kabbani, Ahmad T.; Pradeep, Thalappil; Ajayan, Pulickel M. (2015)
      Carbon nanotubes can be chemically modified by attaching various functionalities to their surfaces, although harsh chemical treatments can lead to their break-up into graphene nanostructures. On the other hand, direct ...
    • Atomic cobalt on nitrogen-doped graphene for hydrogen generation 

      Fei, Huilong; Dong, Juncai; Arellano-Jiménez, M. Josefina; Ye, Gonglan; Kim, Nam Dong; Samuel, Errol L.G.; Peng, Zhiwei; Zhu, Zhuan; Qin, Fan; Bao, Jiming; Yacaman, Miguel Jose; Ajayan, Pulickel M.; Chen, Dongliang; Tour, James M. (2015)
      Reduction of water to hydrogen through electrocatalysis holds great promise for clean energy, but its large-scale application relies on the development of inexpensive and efficient catalysts to replace precious platinum ...
    • Blueshift of the A-exciton peak in folded monolayer 1H-MoS2 

      Crowne, Frank J.; Amani, Matin; Birdwell, A. Glen; Chin, Matthew L.; OメRegan, Terrance P.; Najmaei, Sina; Liu, Zheng; Ajayan, Pulickel M.; Lou, Jun; Dubey, Madan (2013)
    • Charge-transfer-based Gas Sensing Using Atomic-layer MoS2 

      Cho, Byungjin; Hahm, Myung Gwan; Choi, Minseok; Yoon, Jongwon; Kim, Ah Ra; Lee, Young-Joo; Park, Sung-Gyu; Kwon, Jung-Dae; Kim, Chang Su; Song, Myungkwan; Jeong, Yongsoo; Nam, Kee-Seok; Lee, Sangchul; Yoo, Tae Jin; Kang, Chang Goo; Lee, Byoung Hun; Ko, Heung Cho; Ajayan, Pulickel M.; Kim, Dong-Ho (2015)
      Two-dimensional (2D) molybdenum disulphide (MoS2) atomic layers have a strong potential to be used as 2D electronic sensor components. However, intrinsic synthesis challenges have made this task difficult. In addition, the ...
    • CVD-grown monolayered MoS2 as an effective photosensor operating at low-voltage 

      Perea-López, Néstor; Lin, Zhong; Pradhan, Nihar R.; Iñiguez-Rábago, Agustín; Elías, Ana Laura; McCreary, Amber; Lou, Jun; Ajayan, Pulickel M.; Terrones, Humberto; Balicas, Luis; Terrones, Mauricio (2014)
      We report the fabrication of a photosensor based on as-grown single crystal monolayers of MoS2synthesized by chemical vapor deposition (CVD). The measurements were performed using Au/Ti leads in a two terminal configuration ...
    • Dynamic Self-Stiffening in Liquid Crystal Elastomers 

      Agrawal, Aditya; Chipara, Alin C.; Shamoo, Yousif; Patra, Prabir K.; Carey, Brent J.; Ajayan, Pulickel M.; Chapman, Walter G.; Verduzco, Rafael (2013)
      Biological tissues have the remarkable ability to remodel and repair in response to disease, injury and mechanical stresses. Synthetic materials lack the complexity of biological tissues, and man-made materials that respond ...
    • Efficient Modulation of 1.55 μm Radiation with Gated Graphene on a Silicon Microring Resonator 

      Qiu, Ciyuan; Gao, Weilu; Vajtai, Robert; Ajayan, Pulickel M.; Kono, Junichiro; Xu, Qianfan (2014)
      The gate-controllability of the Fermi-edge onset of interband absorption in graphene can be utilized to modulate near-infrared radiation in the telecommunication band. However, a high modulation efficiency has not been ...
    • Electrical performance of monolayer MoS2 field-effect transistors prepared by chemical vapor deposition 

      Amani, Matin; Chin, Matthew L.; Birdwell, A. Glen; OメRegan, Terrance P.; Najmaei, Sina; Liu, Zheng; Ajayan, Pulickel M.; Lou, Jun; Dubey, Madan (2013)
      Molybdenum disulfide (MoS2) field effect transistors (FET) were fabricated on atomically smooth large-area single layers grown by chemical vapor deposition. The layer qualities and physical properties were characterized ...
    • Electrically tunable hot-silicon terahertz attenuator 

      Wang, Minjie; Vajtai, Robert; Ajayan, Pulickel M.; Kono, Junichiro (2014)
      We have developed a continuously tunable, broadband terahertz attenuator with a transmission tuning range greater than 103. Attenuation tuning is achieved electrically, by simply changing the DC voltage applied to a heating ...
    • Fluorinated Graphene Oxide: a New Multimodal Material for Biological Applications 

      Romero-Aburto, Rebeca; Narayanan, Tharangattu N.; Nagaoka, Yutaka; Hasumura, Takashi; Mitcham, Trevor M.; Fukuda, Takahiro; Cox, Paris J.; Bouchard, Richard R.; Maekawa, Toru; Kumar, Sakthi; Torti, Suzy V.; Mani, Sendurai A.; Ajayan, Pulickel M. (2013)
      Fluorinated graphene oxide (FGO) is reported for the first time as a magnetically responsive drug carrier that can serve as a MRI and photoacoustic contrast agent, under pre-clinical settings, as well as a photothermal ...
    • Graphene as an atomically thin interface for growth of vertically aligned carbon nanotubes 

      Rao, Rahul; Chen, Gugang; Arava, Leela Mohana Reddy; Kalaga, Kaushik; Ishigami, Masahiro; Heinz, Tony F.; Ajayan, Pulickel M.; Harutyunyan, Avetik R. (2013)
      Growth of vertically aligned carbon nanotube (CNT) forests is highly sensitive to the nature of the substrate. This constraint narrows the range of available materials to just a few oxide-based dielectrics and presents a ...
    • Graphene–protein field effect biosensors: glucose sensing 

      Viswanathan, Sowmya; Narayanan, Tharangattu N.; Aran, Kiana; Fink, Kathryn D.; Paredes, Jacobo; Ajayan, Pulickel M.; Filipek, Slawomir; Miszta, Przemyslaw; Tekin, H. Cumhur; Inci, Fatih; Demirci, Utkan; Li, Pingzuo; Bolotin, Kirill I.; Liepmann, Dorian; Renugopalakrishanan, V. (2015)
      Chronic diseases are becoming more prevalent, and the complexities of managing patients continue to escalate, since their care must be balanced between the home and clinical settings. Diabetes is the most advanced example, ...
    • Hybrid 2D Nanomaterials as Dual-mode Contrast Agents in Cellular Imaging 

      Narayanan, Tharangattu N.; Gupta, Bipin K.; Vithayathil, Sajna A.; Aburto, Rebeca R.; Mani, Sendurai A.; Taha-Tijerina, Jaime; Xie, Bin; Kaipparettu, Benny A.; Torti, Suzy V.; Ajayan, Pulickel M. (2012)
    • Liquid metal nanodroplet dynamics inside nanocontainers 

      Jung, Hyun Young; Chun, Hyunkyung; Park, Sora; Kang, Seoung-Hun; Ahn, Chi Won; Kwon, Young-Kyun; Upmanyu, Moneesh; Ajayan, Pulickel M.; Jung, Yung Joon (2013)
      Here we report direct observations of spatial movements of nanodroplets of Pb metal trapped inside sealed carbon nanocontainers. We find drastic changes in the mobility of the liquid droplets as the particle size increases ...
    • Lithium storage mechanisms in purpurin based organic lithium ion battery electrodes 

      Reddy, Arava Leela Mohana; Nagarajan, Subbiah; Chumyim, Porramate; Gowda, Sanketh R.; Pradhan, Padmanava; Jadhav, Swapnil R.; Dubey, Madan; John, George; Ajayan, Pulickel M. (2012)
      Current lithium batteries operate on inorganic insertion compounds to power a diverse range of applications, but recently there is a surging demand to develop environmentally friendly green electrode materials. To develop ...
    • Metallic 1T phase source/drain electrodes for field effect transistors from chemical vapor deposited MoS2 

      Kappera, Rajesh; Voiry, Damien; Yalcin, Sibel Ebru; Jen, Wesley; Acerce, Muharrem; Torrel, Sol; Branch, Brittany; Lei, Sidong; Chen, Weibing; Najmaei, Sina; Lou, Jun; Ajayan, Pulickel M.; Gupta, Gautam; Mohite, Aditya D.; Chhowalla, Manish (2014)
      Two dimensional transitionmetal dichalcogenides (2D TMDs) offer promise as optoelectronic materials due to their direct band gap and reasonably good mobility values. However, most metals form high resistance contacts on ...
    • Multi-stimuli responsive Cu2S nanocrystals as trimodal imaging and synergistic chemo-photothermal therapy agents 

      Poulose, Aby Cheruvathoor; Veeranarayanan, Srivani; Mohamed, M. Sheikh; Nagaoka, Yutaka; Aburto, Rebeca Romero; Mitcham, Trevor; Ajayan, Pulickel M.; Bouchard, Richard R.; Sakamoto, Yasushi; Yoshida, Yasuhiko; Maekawa, Toru; Kumar, D. Sakthi (2015)
      A size and shape tuned, multifunctional metal chalcogenide, Cu2S-based nanotheranostic agent is developed for trimodal imaging and multimodal therapeutics against brain cancer cells. This theranostic agent was highly ...
    • Observing the interplay between surface and bulk optical nonlinearities in thin van der Waals crystals 

      Deckoff-Jones, Skylar; Zhang, Jingjing; Petoukhoff, Christopher E.; Man, Michael K.L.; Lei, Sidong; Vajtai, Robert; Ajayan, Pulickel M.; Talbayev, Diyar; Madéo, Julien; Dani, Keshav M. (2016)
      Van der Waals materials, existing in a range of thicknesses from monolayer to bulk, allow for interplay between surface and bulk nonlinearities, which otherwise dominate only at atomically-thin or bulk extremes, respectively. ...
    • Optoelectronic crystal of artificial atoms in strain-textured molybdenum disulphide 

      Li, Hong; Contryman, Alex W.; Qian, Xiaofeng; Ardakani, Sina Moeini; Gong, Yongji; Wang, Xingli; Weisse, Jeffrey M.; Lee, Chi Hwan; Zhao, Jiheng; Ajayan, Pulickel M.; Li, Ju; Manoharan, Hari C.; Zheng, Xiaolin (2015)
      The isolation of the two-dimensional semiconductor molybdenum disulphide introduced a new optically active material possessing a band gap that can be facilely tuned via elastic strain. As an atomically thin membrane with ...