Science Dialectica Forum - Recent Posts https://www.scdialectica.com/community/ Science Dialectica Discussion Board en-US Thu, 23 Apr 2026 04:26:48 +0000 wpForo 60 RE: What is the reason behind unequal current/voltage signal (upper and lower part) in a transient output from a piezoelectric nanogenerator when measured through oscilloscope? https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-10 Wed, 23 Sep 2020 10:32:44 +0000 Suman https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-10 RE: What is the reason behind unequal current/voltage signal (upper and lower part) in a transient output from a piezoelectric nanogenerator when measured through oscilloscope? https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-9 Wed, 23 Sep 2020 06:56:44 +0000 Sayan https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-9 RE: What is the reason behind unequal current/voltage signal (upper and lower part) in a transient output from a piezoelectric nanogenerator when measured through oscilloscope? https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-8 Mon, 21 Sep 2020 19:44:38 +0000 unequal means the bipolar signal or the dissimilar values of voltage/current?

]]> Suman https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-8 RE: What is the reason behind unequal current/voltage signal (upper and lower part) in a transient output from a piezoelectric nanogenerator when measured through oscilloscope? https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-7 Sun, 20 Sep 2020 14:38:36 +0000 The reason behind this unequal voltage/current signal could be the screening of piezoelectric charges developed in the strained sample during the bi-directional flow of electrons through the external circuit. Various kinds of surface states present in the sample affect the concentration of piezo-charges which can partially hinder the electron flow. 

]]> Sourabh https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-7 What is the reason behind unequal current/voltage signal (upper and lower part) in a transient output from a piezoelectric nanogenerator when measured through oscilloscope? https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-6 Sun, 20 Sep 2020 13:53:24 +0000 What is the reason behind unequal current/voltage signal (upper and lower part) in a transient output from a piezoelectric nanogenerator when measured through oscilloscope?

]]> Sayan https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-reason-behind-unequal-current-voltage-signal-upper-and-lower-part-in-a-transient-output-from-a-piezoelectric-nanogenerator-when-measured-through-oscilloscope/#post-6 RE: Graphene https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-5 Sat, 19 Sep 2020 05:48:21 +0000 Graphene shows Ambipolar R-Vg characteristics . By observing the charge neutrality point ( maximum resistance )you can understand the conductivity type of your graphene device. 

Vd = 0 represents undoped graphene. 

Vd = +ve represents  p doped. 

Vd = -ve represents n doped. 

Vd represents the gate voltage at the charge neutrality point. 

]]> Shubhrasish https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-5 RE: Graphene https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-4 Sat, 19 Sep 2020 04:19:51 +0000 Although Hall is good technique to find conductivity types, it becomes confusive for 2D materials specially in monolayer. I would like to go for resistance vs gate voltage technique. But in three terminal device, how resistance varies with n type or p type graphene?

]]> Sayan https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-4 RE: Graphene https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-3 Sat, 19 Sep 2020 03:44:54 +0000 You can demonstrate that by making Hall measurement before and after transformation.  Also in 3 terminal device configuration it can be understood by measuring resistance as a function of  gate voltages. 

]]> Shubhrasish https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-3 Graphene https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-2 Fri, 18 Sep 2020 05:57:31 +0000 How to demonstrate experimentally the transformation of graphene from n-type to p-type ?

]]> Sayan https://www.scdialectica.com/community/materials-science-and-nanotechnology/graphene/#post-2 what is the difference between bio-battery or microbial battery and microbial fuel cell ? https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-difference-between-bio-battery-or-microbial-battery-and-microbial-fuel-cell/#post-1 Mon, 07 Sep 2020 16:12:49 +0000 I have a doubt in is there any difference in the working principle between bio-battery or microbial battery and microbial fuel cells? Can I say bio-battery store charge and MFC coverts energy?

]]> Suman https://www.scdialectica.com/community/green-energy-and-sustainability/what-is-the-difference-between-bio-battery-or-microbial-battery-and-microbial-fuel-cell/#post-1