Effect of nitrogen on deposition and field emission properties of boron-doped micro- and nano-crystalline diamond films

Abstract

In this paper, we report the effect of nitrogen on the deposition and properties of boron doped diamond films synthesized by hot filament chemical vapor deposition. The diamond films consisting of micro-grains (nano-grains) were realized with low (high) boron source flow rate during the growth processes. The transition of micro-grains to nano-grains is speculated to be strongly (weekly) related with the boron (nitrogen) flow rate. The grain size and Raman spectral feature vary insignificantly as a function of the nitrogen introduction at a certain boron flow rate. The variation of electron field emission characteristics dependent on nitrogen is different between microcrystalline and nanocrystalline boron doped diamond samples, which are related to the combined phase composition, boron doping level and texture structure. There is an optimum nitrogen proportion to improve the field emission properties of the boron-doped films. [5][6][7] affected by doping have been extensively investigated. However, in previous work, the understanding on how the dopants (mainly refer to N and B) modify the growth and properties of diamond films was mostly emphasized on the sole doping by boron or nitrogen. Recently, there are a few reports on the diamond deposition with co-dopants [8,9]. Hartmann et al. [8] reported that in highly boron-doped micro-diamond, large (small) additions of nitrogen would stabilize the diamond structure (induce more graphite formation). The electronic structure of boron-doped nano-diamond films can be markedly modified by nitrogen and there was an optimized gas proportion to achieve improved field emission [9]. However, the corresponding underlying mechanism is still not very clear. Furthermore, growth features related to the co-doping of boron and nitrogen are desirable to be investigated in detail.In this letter, by hot filament CVD (HFCVD), the microcrystalline diamond (MCD) and nanocrystalline diamond (NCD) films with co-introducing boron and nitrogen were synthesized by adjusting the gas proportion of nitrogen and boron in the reaction ambient. The effect of nitrogen on the

Boron/nitrogen co-doped diamond electrode for highly efficient electrochemistry detection of aniline

“…Figure 2(b) shows the XRD patterns of the BND and BDD films. The diffraction peaks at 44.1°, 75.5°, and 91.8° correspond to the (111), (220), and (311) planes of diamond, respectively [17,35,36]. The dominant (111) and (220) peaks denote that the BND and BDD films mainly consist of (111) and (110) orientated grains, which is accordant with the SEM images shown in Figure 1.…”

“…Noted that for the BND sample, additionally, the broad bands of 1500 cm −1 indicate that the non-diamond carbon mainly comes from the grain boundaries, while the stronger 1500 cm −1 band of the BND film is due to nitrogen atoms preferentially entering the grain boundaries and promoting the formation of sp 2 C-N bonds [35,36]. The broad bands of 2060 cm −1 of the BND film corresponds to N-V 0 formed by the recombination of nitrogen and vacancies [37].…”

Field emission from in situ-grown vertically aligned SnO2 nanowire arrays

“…It can be seen that, besides the noise districts, the three plots go near to a straight line. It indicates that the field emission from the in situ -grown SnO 2 nanowire arrays follows the FN relationship well, and the field emission process is a barrier tunneling quantum mechanical process [ 30 , 31 ].…”

Diamond and coesite in ultrahigh-pressure–ultrahigh-temperature granulites from Ceuta, Northern Rif, northwest Africa

“…The sharp bands at~1450 and~1525À1550 cm À1 are tentatively interpreted either as modified carbon vibrations produced by nitrogen in the diamond structure (e.g. Li et al, 2009Li et al, , 2010 or as bands produced by other polymorphs of carbon, as observed in shocked graphite and diamond from the Ries crater (e.g. Lapke et al, 2000).…”